Division 4.1.3 Maximum train length (BP11)
United Kingdom
High-speed trains suitable for running on the interoperable network shall be made up of fixed-consist trainsets (indivisible in service), able to run either singly (single unit) or coupled together (units in multiple).
The maximum length of the trains thus formed shall not exceed 400 m. A tolerance of 1 % is permissible in order to improve aerodynamic penetration of the front and rear of the train.
To allow them to operate in the terminal stations on the network, the maximum length of the trains shall be compatible with the length of platforms on high-speed and conventional lines that they are intended to serve on the trans-European network.