Provision of friction material for the brake blocks used across the London Underground fleet

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 inhib...