Automated pantograph early warning hook-up detection and prevention system for 3 kv dc, 25 kv ac and 50 kv ac railway electrification

Transnet Freight Rail Technology Management requires supply, commissioning and long-term support for an Automated Pantograph Early Warning Hook-up Detection and Prevention System. The system must be interchangeable across three electrical systems: 3 kV DC, 25 kV AC and 50 kV AC. Purpose is to detect degraded or non-conforming Overhead Track Equipment in advance, prevent pantograph damage by triggering pre-emptive lowering, and record diagnostic and visual data for maintenance teams. Bidders must consult Appendix A (Schedule of Requirements) and ensure product compliance. Appendix B provides locomotive vehicle gauge dimensions for infrastructure clearance reference.

Closing: 28 October 2026 at 10:00

Commissioning period: 90 days from first day of installation on a locomotive for in-service testing. If commissioning is not completed within 90 days, the way forward resides with Transnet representatives.

Guarantee period: Minimum 12 months from date of commissioning and acceptance by Transnet.

Support period: 10 years technical support including 20 on-site visits.

Spare parts agreement: To be discussed and agreed after 3 years of operation.

Video compatibility: Stored footage must remain compatible with Windows Media Player or equivalent for minimum 10 years.

Quality management: ISO 9001 certification required, scope must cover repair, upgrade, replace, testing and commissioning. Valid certificate to be submitted with tender.

Calibration: SANAS-accredited calibration certificate or OEM certificate of conformity required at handover. If no SANAS laboratory exists in South Africa for the specific calibration, a non-SANAS laboratory traceable to international and national standards is permitted with written authorisation from a Transnet representative.

Technical compliance: System must meet all technical, environmental and electrical service conditions stated in the specification.

Documentation: All drawings and technical documentation in English, metric units, with numbered files for identification.

Type test certificates: Design and type test certificates required to verify conformance; to be submitted with tender documents.

Spare parts: Tenderer must guarantee availability of all spare parts for 10 years. Spare parts list to be agreed with Transnet after 3 years of operation based on parts used.

Obsolescence: Supplier must ensure system remains operational for 10 years; no obsolescence may render the system unusable.

Training: Programme for maintenance and operation to be described, with costs.

Preliminary quality control plan: Required, indicating hold points during repair, upgrade, testing, commissioning and transportation.

Procurement: Supply, commissioning and long-term support for one Automated Pantograph Early Warning Hook-up Detection and Prevention System for Transnet Freight Rail Technology Management.

Electrical compatibility: System must operate interchangeably under three conditions — 3 kV DC, 25 kV AC, and 50 kV AC. Specific voltage ranges: 50 kV AC (nominal), 60 kV AC highest permanent, 28 kV AC lowest; 25 kV AC (nominal), 27.5 kV AC highest permanent, 22.5 kV AC lowest; 3 kV DC (nominal), 3.9 kV DC highest permanent, 2.4 kV DC lowest.

Environmental conditions: Altitude 0–1980 m above sea level; relative humidity up to 100%; ambient temperature -10°C to +55°C; wind pressure 750 Pa; lightning 20 ground flashes/km² per annum; pollution including frost, heavy salt and industrial pollutants including diesel-electric locomotive emissions.

OHTE condition detection:

• Detect degraded or non-conforming OHTE sections in advance (vandalism, wear, non-electrified sections, broken droppers, vegetation, foreign objects)
• Minimum detection distance: 120 m ahead at 80 km/h
• Automatic lowering command with minimum 5-second lead time before non-conforming section
• Pantograph fully lowered before reaching non-electrified, damaged or obstructed sections
• Monitor all OHTE positions in contact with collector head
• Identify OHTE below top of carbon contact strip moving toward collector head (overlaps, crossovers)

Pantograph condition monitoring:

• Carbon contact strip chips exceeding 3 mm width
• Carbon contact strip cracks exceeding 3 mm width
• Cracks running top to bottom of carbon portion
• Steps deeper than 1 mm in carbon contact strip
• Abnormal rotational movement or angular deviation (flip/tilt) exceeding safe limits in pitch, roll, yaw
• Continuous height measurement from top of rail to carbon contact strip (laser, radar or visual triangulation), detecting gradual drift or sudden deviation
• End horn contact detection (insulated and metalised segments), with stored geometric profiles per pantograph model
• Real-time vertical, horizontal and lateral contact force monitoring, timestamped and GPS-logged; sudden spikes trigger diagnostic logs

Arcing and sparking detection:

• Identify arcing/sparking exceeding 5 ms using high-speed video and/or current signature analysis
• Log arcing frequency for IEC 62486-based evaluation
• Flag sections with >0.2% arcing for infrastructure inspection

Video surveillance:

• HD recording ≥1080p at up to 120 FPS
• Time, date and GPS coordinate stamps positioned away from primary viewing area
• 10 days local storage with playback without full download
• Download of 10 days footage within 4 hours (1 Gbps Ethernet or USB 3.0)
• Minimum 10× zoom maintaining diagnostic clarity
• Playback via Windows Media Player only; no OEM applications
• 10-year compatibility guarantee with Windows Media Player or equivalent
• Adequate illumination for day and night recording; alternative solutions acceptable if no light source used
• Incident location via time/date or GPS coordinates using laptop during download
• Tamper-proof storage: no editing or deletion capability; password protected with 3 recoverable/changeable passwords for 3 Transnet System Administrators

Real-time obstacle and intrusion detection:

• Stereoscopic or triangulation-based imaging
• Detect vegetation encroachment, fallen branches, dislodged OHTE hardware, suspended debris
• Operate up to 80 km/h; alert on lateral/vertical intrusion into pantograph dynamic envelope or sudden sway/ride profile changes

Data handling:

• Low severity data: 10 days retention
• Medium severity data: 360 days retention; exported for degradation monitoring
• High severity data: 60 days retention; exported for degradation and corrective intervention monitoring

User configuration:

• Adjustable fault detection thresholds
• Updatable notification contact lists (email and mobile)
• Secondary users with individual passwords and limited rights (data access, video download, system calibration, routine maintenance)

Power management:

• Safe shutdown on locomotive main power off; automatic restart on power restoration
• Independent backup power source (not locomotive battery) for shutdown completion and data retention

GPS independence: Maintain operation and data logging during GPS signal loss; timestamp via internal date/time reference

Fault notification: Instant dual-alert (e.g. SMS and email or data message) to up to 5 designated Transnet representatives for high-severity faults; alert includes locomotive ID, GPS location, date/time, and two-word fault description

Performance: Full functionality across 0–100 km/h with accuracy ±3% or better

Mechanical requirements:

• Withstand shock and vibration per BS EN 61373
• IP and OV rated exterior and interior components
• Cables/wiring between exterior and interior: rated for all electrical voltages, housed in earthed structure with 18 mm minimum diameter braided shunt strap to locomotive roof
• Roof components: housed in earthed structure with 18 mm minimum diameter braided shunt strap to roof
• Self-cleaning and self-calibrating: 90 days without physical intervention or visual inspection
• All components, securing mechanisms, hardware, systems, maintenance activities and housings fit for purpose

Training: Maximum 10 Transnet representatives

Technical support: Telephonic or electronic support plus 20 on-site visits over 10 years

Repairs: Off-site repairs returned to tenderer at local South African address

Documentation: All in English, metric units, numbered files; type test certificates and safety integrity documentation required; Transnet reserves right to request additional manuals, catalogues, drawings

Normative references: IEC 62497-1; ISO 9001; SANS 60529-1; BS EN 61373; BS EN 50367; BS EN 50206-1; BS EN 50388; Transnet RSE/TE/SPC/0030 and RSE/TE/SPC/0029

ISO 9001: Quality management system certification mandatory. Scope must cover repair, upgrade, replace, testing and commissioning. Valid certificate to be submitted with tender.

Preliminary quality control plan: Required, clearly indicating hold points during repair, upgrade, testing, commissioning and transportation.

Calibration: SANAS-accredited calibration certificate or OEM certificate of conformity required at handover. If no SANAS laboratory exists in South Africa for the specific calibration, non-SANAS laboratory traceable to international and national standards permitted with written Transnet authorisation.

Design and type test certificates: Required to verify conformance to specification requirements; submit with tender documents.

Type test certificates and safety integrity documentation required.

Normative standards: IEC 62497-1; ISO 9001; SANS 60529-1; BS EN 61373; BS EN 50367; BS EN 50206-1; BS EN 50388; Transnet RSE/TE/SPC/0030 and RSE/TE/SPC/0029.

Quality management: ISO 9001 certification required, with scope covering repair, upgrade, replace, testing and commissioning. Certificate to be submitted with tender.

Calibration: SANAS-accredited calibration certificate or OEM certificate of conformity required at handover. Non-SANAS laboratory permitted only if no SANAS facility exists in South Africa for the specific calibration, and with written Transnet authorisation; must be traceable to international and national standards.

Design and type test certificates: Required to verify conformance; submit with tender.

Preliminary quality control plan: Required, showing hold points during repair, upgrade, testing, commissioning and transportation.

No CSD, tax clearance, B-BBEE, CIDB, CIPC or local content requirements stated in this specification document.

Electrical safety: All components rated for IP and OV. Cables and wiring between exterior and interior sections rated for all electrical voltages, housed in earthed structure with 18 mm minimum diameter braided shunt strap to locomotive roof. Roof components in earthed structure with 18 mm minimum diameter braided shunt strap to roof.

Arcing detection: System identifies arcing/sparking exceeding 5 ms; flags sections with >0.2% arcing for infrastructure inspection.

Power safety: Independent backup power source (not locomotive battery) for safe shutdown and data retention when main locomotive power is off.

Mechanical safety: System withstands shock and vibration per BS EN 61373. Self-cleaning and self-calibrating components function for 90 days without physical intervention.

Operating environment: Altitude 0–1980 m above sea level; relative humidity up to 100%; ambient temperature -10°C to +55°C; wind pressure 750 Pa; lightning 20 ground flashes/km² per annum; pollution including frost, heavy salt laden with industrial pollutants and diesel-electric locomotive emissions.

System must withstand shock and vibration caused by OHTE interacting with pantograph collector head per BS EN 61373.

All exterior and interior components suitably designed for IP and OV ratings.

Commissioning: Tenderer must commission for all three electrical conditions. Transnet representatives have right to attend all commissioning, fault finding and system introduction activities. Commissioning completion limited to 90 days from first installation on locomotive for in-service testing. If 90 days lapse without completion, way forward determined by Transnet. System acceptance report signed only after successful testing, commissioning and discussions between Transnet representatives and tenderer.

Guarantees and defects: All guarantees and warranties in writing. Tenderer guarantees conformance to Transnet requirements and fitness for purpose. Liability for makers' defects in design, material and workmanship. Minimum 12-month guarantee against manufacturing and material defects from date of commissioning and acceptance.

Packaging, storage and handling: System components protected from damage during transportation, handling and storage.

Repairs: Off-site repairs returned to tenderer at local South African address.

Spare parts: All spare parts available for 10 years; list agreed after 3 years of operation. Obsolescence must not render system unusable; tenderer ensures 10-year operational life.

Support: Telephonic or electronic technical support plus 20 on-site visits over 10 years.

Training: Maximum 10 Transnet representatives on system operation and maintenance.

Technical compliance with all specification requirements including environmental, electrical and mechanical service conditions. ISO 9001 quality management certification mandatory, with scope covering repair, upgrade, replace, testing and commissioning. Calibration certificates from SANAS-accredited or equivalent bodies required. Design and type test certificates to verify conformance. Preliminary quality control plan with defined hold points. Ten-year spare parts availability and obsolescence protection. Training programme for up to 10 Transnet representatives. Technical support including 20 on-site visits over 10 years.

Transnet Freight Rail (TFR) seeks information for the supply, commissioning and support of an Automated Pantograph Early Warning Hook-Up Detection and Prevention System operating under 3 kV DC, 25 kV AC and 50 kV AC conditions. The system aims to address a high incidence of pantograph hook-up events (102 in the North Corridor during 2024/2025) caused by security (theft/vandalism), rolling stock and infrastructure issues. Transnet aims to reduce costs, improve availability, receive proactive improvements, leverage leading-edge technology, ensure reliable support, and streamline acquisition processes through a partnership approach.

Issue date: 2 October 2026.

Non-compulsory briefing session: 14 October 2026, 10:00 AM – 12:00 PM via Microsoft Teams (duration approximately 2 hours). Attendance must be confirmed by emailing contact details and number of representatives to [email protected].

Clarification request deadline: 20 October 2026.

Closing date and time: 28 October 2026 at 10:00 AM.

Bid validity period: 180 days after closing date.

Non-compulsory RFI briefing session via Microsoft Teams on 14 October 2026, 10:00 AM – 12:00 PM (approximately 2 hours). Session starts punctually; information will not be repeated for late joiners. Bidders must confirm attendance by emailing contact details and number of representatives to [email protected].

Enquiries (bidding procedure / technical):

• Contact: Gladys Mtambo
• Email: [email protected]
• Telephone: 011 584 0597

Complaints:

• Email: [email protected]

Submission portal: https://transnetetenders.azurewebsites.net

Tender documents also available from National Treasury e-Tender Portal: www.etenders.gov.za

Submission method: electronic upload via Transnet e-Tender Submission Portal (https://transnetetenders.azurewebsites.net).

Closing date and time: 28 October 2026 at 10:00 AM.

Upload limits: 30 MB per upload; multiple uploads permitted.

Bidders must register their own company profile on the portal and submit through that profile; no company may submit on behalf of another.

For joint ventures, any JV party may use its registered profile to submit on behalf of the JV.

All returnable documents must be signed, stamped and dated on every page before upload.

Mandatory returnable documents: SBD 1 Form (Invitation to Bid); Section 5 Proposal Form and List of Returnable Documents; Section 6 Certificate of Acquaintance with RFP, Master Agreement & Applicable Documents; Section 7 RFP Declaration and Breach of Law Form; CSD Registration report; latest Financial Statements (signed by Accounting Officer or audited) plus two previous years; Joint Venture Agreement or written confirmation of intention to enter into a JV (if applicable).

Returnable documents used for scoring: none listed.

Essential returnable documents: same as mandatory list above; failure to provide allows a further opportunity to submit by a set deadline, after which disqualification may follow.

Clarification requests: submit RFI Clarification Request Form (Section 8) to [email protected] by 20 October 2026.

Complaints: email [email protected].

No late submissions accepted. Bid validity: 180 days after closing date; may be extended on request.

This is a Request for Information (RFI); no formal evaluation or scoring will be performed at this stage. Respondents are advised to adhere to the details in Annexure A (Specifications) and Annexure B (Evaluation Criteria) for the subsequent RFP process.

For the future RFP, the estimated value does not exceed R50 000 000 (all applicable taxes included), therefore the 80/20 preference point system will apply (price 80 points, B-BBEE 20 points). Transnet will use the lowest acceptable bid to determine the applicable preference point system if all acceptable bids fall outside the stated system.

Specific goals for preference points: Black Women Ownership (at least 30%), Black Ownership (at least 51%), Black Youth Ownership (at least 51%).

Required B-BBEE evidence: B-BBEE certificate issued by a SANAS-accredited verification agency, or a sworn affidavit (EMEs and QSEs), or a B-BBEE CIPC certificate; consolidated scorecard accepted for joint ventures.

Scope: Supply, commissioning and support for an Automated Pantograph Early Warning Hook-Up Detection and Prevention System operating under 3 kV DC, 25 kV AC and 50 kV AC conditions.

Background: Transnet Freight Rail (TFR) experiences a high number of pantograph hook-up incidents across all corridors. In the 2024/2025 financial year, the North Corridor recorded 102 incidents: 29 attributed to security (contact wire theft, vandalism, attempted theft), 25 to rolling stock issues, and 17 to infrastructure issues.

Objectives: Reduce acquisition cost and improve service through supplier economies of scale; achieve appropriate availability while reducing costs for both parties; receive proactive improvements in goods/services and processes; strengthen Transnet's competitive advantage through leading-edge technology and service delivery; ensure reliable supplier personnel for service enquiries, recommendations and substitutions; streamline acquisition and managed service processes on a Group basis.

Environmental: Respondents must submit details of their entity's environmental policies covering waste disposal, recycling and energy conservation.

Additional information: Respondents are encouraged to include any other relevant information not explicitly requested; submissions are not limited to the criteria in the annexures.

Authority to sign requirements:

• Company: certified copy of Board of Directors resolution (personally signed by Chairman or Secretary) authorising the signatory.
• Partnership: certified copy of partners' resolution (personally signed by all partners) authorising the signatory.
• One-man business: certified proof that the signatory is the sole owner.

Failure to comply may result in rejection of the RFI response.

No specific experience or qualification thresholds are stated for this RFI; respondents are encouraged to include relevant information demonstrating capability.

No pricing schedule, bill of quantities, or rates are required for this RFI. Potential bidders are requested to submit a brochure where possible. For a future RFP, the successful respondent must demonstrate financial capacity to fund Transnet's requirements. Transnet may request audited financial statements for due diligence. Bid validity is 180 days after closing, extendable on request.

No pricing schedule or bid security is required for this RFI.

For any subsequent RFP, the successful respondent must demonstrate the ability to fund Transnet's requirements as a condition precedent to award.

Transnet reserves the right to request audited financial statements or other documentation for due diligence.

Transnet will not reimburse any respondent for preparatory costs or other work performed in connection with this submission.

Bid validity: 180 days after closing date; may be extended on request at the same terms and conditions.

CSD registration: Mandatory self-registration on National Treasury Central Supplier Database (https://secure.csd.gov.za/) prior to submission; foreign suppliers with no local registered entity are exempt.

Tax compliance: SARS Tax Compliance Status (TCS) PIN required; alternatively a printed TCS certificate or CSD number may be submitted. Each party to a joint venture/consortium must submit a separate TCS PIN/certificate/CSD number.

B-BBEE: B-BBEE status level certificate (SANAS-accredited), sworn affidavit (EMEs/QSEs), or B-BBEE CIPC certificate must be submitted for compliance with the B-BBEE Act. Consolidated scorecard accepted for joint ventures.

Authority to sign: Certified copy of Board resolution (company), partners' resolution (partnership), or certified proof of sole ownership (one-man business) authorising the signatory must be submitted; failure may result in rejection.

Security clearance: May apply (referenced in document structure).

No serious breach of law in the preceding 5 years (including Competition Act) by the bidding entity or its directors/members/partners; disclosure required if applicable.

Declaration of Interest (SBD 4) and Certificate of Independent Bid Determination (SBD 9) are included as standard forms to be completed.

Preference point system: 80/20 (price 80, B-BBEE 20) applicable as estimated value does not exceed R50 million.

Required evidence: B-BBEE status level certificate from SANAS-accredited verification agency; or sworn affidavit for EMEs (revenue ≤ R10 million) and QSEs (revenue ≤ R50 million); or B-BBEE CIPC certificate. Consolidated scorecard accepted for joint ventures.

Specific goals for preference points:

• Black Women Ownership: at least 30%
• Black Ownership: at least 51%
• Black Youth Ownership: at least 51%

Certified copies of ID documents of owners (not older than 3 months) required for specific goals claims.

False B-BBEE information may lead to disqualification, cost recovery, contract cancellation, penalties up to 10% of contract value, restriction from state business for up to 10 years, and criminal prosecution.

Transnet requires respondents to submit details of their entity's environmental policies, covering waste disposal, recycling and energy conservation. This is to understand the company's position on environmental commitments.

Mandatory compliance: CSD registration (foreign suppliers without local entity exempt); SARS tax compliance (TCS PIN, TCS certificate, or CSD number); B-BBEE evidence (certificate, sworn affidavit, or CIPC certificate); Authority to sign (Board/partners resolution or proof of sole ownership); No serious breach of law in preceding 5 years; Security clearance may apply.

Returnable documents: SBD 1 Form; Section 5 Proposal Form; Section 6 Certificate of Acquaintance; Section 7 RFP Declaration and Breach of Law Form; CSD Registration report; latest Financial Statements (signed by Accounting Officer or audited) plus two previous years; Joint Venture Agreement or written confirmation of intention to enter JV (if applicable).

All returnable documents must be signed, stamped and dated on every page.

Clarification requests via Section 8 form to [email protected] by 20 October 2026.

Environmental policy details required.

Submissions via Transnet e-Tender Portal only; own company profile mandatory; 30 MB per upload limit.

No evaluation or scoring at this RFI stage. Respondents are highly advised to adhere to request details in Annexure A (Specifications) and Annexure B (Evaluation Criteria) for the subsequent RFP process.

For the future RFP: 80/20 preference point system applies (estimated value ≤ R50 million). Transnet will use the lowest acceptable bid to determine the applicable preference point system if all acceptable bids fall outside the stated system.