Unit Formation and Operation
The peak Piccadilly line service requires 76 trains in operation. Each train is made up of two units of three cars. Some units are also formed without a middle cab and are referred to as being "double ended".
All trains in passenger service operate as two units, trains are only permitted to move as a single unit in depots. However one single double ended unit was used to operate the peak-hour Aldwych branch shuttle service until the branch closed in 1994.
The trains are maintained in Cockfosters and Northfields depots.
Like all London Underground trains, the stock operate on a four-rail 630V DC power system.
Read more about this topic: London Underground 1973 Stock
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