On tracks that London Underground share with National Rail third-rail stock (the Bakerloo and District lines both have such sections), the centre rail is connected to the running rails, allowing both types of train to operate, at a compromise voltage of 660 V. Underground trains pass from one section to the other at speed; lineside electrical connections and resistances separate the two types of supply. These routes were originally solely electrified on the four-rail system by the LNWR before National Rail trains were rewired to their standard three-rail system to simplify rolling stock use.
On tracks that London Underground share with National Rail third - rail stock ( the Bakerloo and District lines both have such sections ) , the centre rail is connected to the running rails , allowing both types of train to operate , at a compromise voltage of 660 V. Underground trains pass from one section to the other at speed ; lineside electrical connections and resistances separate the two types of supply . These routes were originally solely electrified on the four - rail system by the LNWR before National Rail trains were rewired to their standard three - rail system to simplify rolling stock use .
Why some sections of Bakerloo and District lines were rewired to three-rail system?
Why some sections of Bakerloo and District lines were rewired to three - rail system ?
to simplify rolling stock use
to simplify rolling stock use