SIST-TP CLC/TR 50452:2007

SIST-TP CLC/TR 50452:2007 is a CENELEC Technical Report, published in the Slovene standards collection by SIST, for railway applications. It gives guidance on the radio remote control system of traction vehicles used in freight traffic with multiple traction, and it focuses on the extra matters that arise when more than one traction vehicle is controlled in the same consist.

What does SIST-TP CLC/TR 50452:2007 specify?

SIST-TP CLC/TR 50452:2007 specifies guidance for applying radio remote control to traction vehicles in multitraction freight operation. The Technical Report is based on EN 50239 and adds points to consider for multiple traction arrangements, especially where radio communication replaces or supplements a cable link.

The document is organized into an introduction and four clauses:

• General
• Typical examples in multiple traction applications
• Information for risk analysis
• Track infrastructure

It also contains Annex A with typical multitraction application examples.

What are the key requirements of SIST-TP CLC/TR 50452:2007?

SIST-TP CLC/TR 50452:2007 centers on how to organize control, communication, and safety for a train consist with more than one traction vehicle. The main practical point is that the Leading Traction Vehicle (LTV) controls the other traction vehicles, called Guided Traction Vehicles (GTV), and the arrangement must stay safe if radio communication is used.

LTV and GTV arrangement

Clause 1 says one traction vehicle acts as the LTV and the others are controlled and monitored by it. Each traction vehicle should be usable either as an LTV or as a GTV. In practice, this means the equipment and operating procedures must support different consist positions and roles.

Communication between traction vehicles

Clause 1 states that communication can be by cable link or radio link, and radio becomes necessary when wagons sit between traction vehicles or when there is no suitable communication cable infrastructure. This matters because the communication method affects system design, installation, and operational limits.

Radio-link considerations

Clause 1 highlights several points for radio operation: vehicle allocation in the consist, unique addresses, maximum number of vehicles in the radio system, response time, radio interference, local infrastructure, and whether the transmission system is a closed or open transmission system under EN 50159-1 or EN 50159-2. For the reader, this means the radio solution must be engineered for addressing, latency, interference, and channel availability, not just basic connectivity.

Risk analysis and braking behaviour

Clause 1 and Clause 3 require risk analysis to consider longitudinal dynamic effort and braking behaviour, especially for long or heavy consists and when wagons are between traction vehicles. Clause 3 also says that if a segmented BP is used, additional measures are needed to maintain the same safety level as with the unsegmented BP assumed in EN 50239. This means the braking concept must be checked against the actual train layout, not only against the radio system itself.

Response to radio interruption

Clause 1 says the response after radio interruption depends on train length, weight, whether the BP is segmented, train speed, interruption duration, and local topography such as tunnels. In practice, operators and system designers must define what happens when the radio link fails, and whether that reaction is manual, automatic, or both.

Safety-relevant functions

Clause 3 extends the safety-relevant functions from EN 50239 to include coordination of power/throttle and brake control, and monitoring of unintended train separation. This is important because loss of coordination or loss of train integrity can create dangerous conditions during multitraction operation.

Track infrastructure

Clause 4 says local circumstances and national regulations should be considered for signal or block section lengths and siding tracks. That means the operating concept must fit the route infrastructure, not only the train equipment.

What terms does SIST-TP CLC/TR 50452:2007 define?

• Leading Traction Vehicle (LTV) - The traction vehicle that sends commands and supervises the other traction vehicles in the consist.
• Guided Traction Vehicle (GTV) - A traction vehicle that is controlled and monitored by the LTV.
• Brake Pipe (BP) - The brake pipe in the train consist, which may be segmented or unsegmented.
• Main Air Pipe (MAP) - The air pipe term used in Annex A for the example configurations.
• Portable transmitter - A remote control transmitter used outside the train consist or cab.
• Train consist - The coupled set of vehicles operated together as one train formation.

Who uses SIST-TP CLC/TR 50452:2007?

SIST-TP CLC/TR 50452:2007 is used by railway freight operators, traction vehicle designers, control-system engineers, and safety or risk analysts. It also matters to infrastructure and operations staff who need to check whether a multitraction radio-control concept fits the route, the braking arrangement, and national operating rules.

What changed in SIST-TP CLC/TR 50452:2007 from the previous edition?

SIST-TP CLC/TR 50452:2007 supersedes R009-005:2001.

Which standards are used with SIST-TP CLC/TR 50452:2007?

• EN 50239 - Provides the base requirements and application examples for radio remote control of traction vehicles for freight traffic.
• EN 50159-1 - Applies where the radio transmission system is treated as a closed transmission system.
• EN 50159-2 - Applies where the radio transmission system is treated as an open transmission system.

What does the SIST-TP CLC/TR 50452:2007 document contain?

SIST-TP CLC/TR 50452:2007 contains a short technical guide rather than a full product standard. Its main content is the general multitraction concept, the operating distinctions for segmented and unsegmented BP arrangements, and the points to include in risk analysis and infrastructure review.

Annex A gives five typical multitraction application examples. These examples show different control arrangements, including control by portable transmitter, control from a traction vehicle, and use of one-side or both-side control. The annex is useful when designing a concept or checking whether a planned operating mode matches the guidance.