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I need to know! Surely they're not half the length of all other lines because the platforms are full length...

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The main reason for many Bakerloo line trains having an extra driving cab car in the train somewhere is because the current carriages/trains were not originally purchased for that line. The current stock is (refurbished) 1972 train sets which were Northern Line stock.

https://en.m.wikipedia.org/wiki/London_Underground_1972_Stock

Northern line trains were a carriage shorter

This page gives a longer overview of the historical rolling stock of the system.

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