Provision of friction material for the brake blocks used across the London Underground fleet
Buyer: Transport for London
- Published
- 24 June 2025
- Lots
- 1
- Notice number
- 034801-2025
- Reference
- ocds-h6vhtk-0552c3
- Official source
- Official source
CPV codes
- 34600000Railway and tramway locomotives and rolling stock and associated parts
Description
All London Underground (LU) passenger rolling stock utilises a tread-brake actuator that applies a friction brake directly to the wheel tread via a brake block to solely provide both emergency and parking brake functions. The service brake function is predominantly fulfilled by the electrodynamic (ED) brake however the implementation and effectiveness of ED braking varies significantly across fleets due to differing braking architectures. In addition, some fleets have a Wheel Slide Protection system that will inhibit the ED to provide braking control via friction only. The current brake block was originally developed in the 1980s and is used on all current LU fleets. This material is not optimised for newer fleets that feature high-capacity ED braking. In LU's modern rolling stock, the ED brake typically handles all the service braking effort above 15 kmph across all axles, below the ED blend out speed the friction brake takes over to bring the train to a stand. Some other trains include "trailer axles" where service braking is achieved solely through friction. Older trains feature lower-capacity ED braking systems, requiring frequent supplementation with friction braking. Recent p…
Official publications
- FTS · 034801-2025 · 24 June 2025
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