Dual Traction Current Supply
Farringdon station is notable because First Capital Connect trains switch between the 25 kV AC overhead supply used to the north of London and the 750 V DC third rail supply used to the south while standing at the platform. The trains that formerly ran to Moorgate used 25 kV AC throughout their journeys.
Until the start of the Thameslink Programme southbound trains that were unable to switch to DC were taken out of service at Farringdon and stabled at Moorgate to prevent them from blocking the core section of the Thameslink route. As this option is no longer possible the catenary has been extended to City Thameslink to enable these trains to continue to the southbound platform at City Thameslink using AC and then return northwards using the new crossover in Snow Hill Tunnel. The pantograph on southbound trains is normally lowered at Farringdon.
Underground trains serving Farringdon use the four-rail 630 V DC system.
Read more about this topic: Farringdon Station
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