Channel Tunnel Rail Link section 1: track and power supply

The track and power supply used on the Channel Tunnel Rail Link is closely based on the French TGV system. The first 74 km section in Kent uses a ballasted track, with UIC60 rails on composite sleepers. But, unlike other high-speed railways, the route has numerous tight bends and a requirement to carry lower-speed traffic, resulting in compromised cant values. Traction power is provided by a French-style overhead 25 kV catenary system, though Eurostar trains also have to run on a 750 V third rail system when stopping at Ashford station.