A' stockThe Metropolitan A60 stock was built by Cravens of Sheffield for the extension of electrification to Amersham and Chesham, and selective four-tracking to Amersham.
- Refurbished by Adtranz Ltd, Derby 1994-1997
Although the Second World War delayed the scheme, it was finally completed in 1962. A total of 248 (124 motor and 124 trailer) aluminium-bodied saloon-type cars were delivered in 1961.
The carriages are unusual for Underground cars in that they have high-backed transverse seating, with two and three seats either side of a central gangway.
Overhead luggage racks were also provided.
These trains completely replaced the locomotive-hauled coaches, and also the electric compartment stock on the Watford line. The original six units had black roofs which lasted until the first overhaul in the mid-1960s.
A further build, called A62 stock, was destined for the Uxbridge line, and 216 cars were delivered. As both batches are virtually identical they are now both used together throughout all Metropolitan line services.
A Metropolitan line train is usually formed from two units, each having four cars. In general, each unit only has a driving cab at one end, though 24 units in the A stock fleet have a cab at each end and so can be driven in service as a four car train. A number of these four car trains were used for services on the Amersham to Chesham branch.
The stock is capable of operational speeds of up to 60mph, however speed is limited to a maximum of 50mph. The braking equipment includes electro-pneumatic service brakes incorporating retardation control to ensure a smooth and even braking. It is now the only stock without electric braking.
Driving motor cars have two pairs of double doors per side and one single leaf door at the end; trailer cars have three pairs of double leaf doors.
|Length per car||53ft 0.5in (16.17m)|
|Normal train length||Eight cars|
(four on Chesham shuttle and East London line)
|Height||12ft 1in (3.89m)|
|Width per car||9ft 8in (2.95m)|
|Unladen weight||21.8-32.1 tonnes|
|Total seating capacity (eight cars)||448|
|Total standing capacity (eight cars)||597|
|Total capacity (eight cars)||1,045*|
As part of the upgrade of the sub-surface lines, new trains will begin to be introduced in 2010 on the Metropolitan line.
By 2015, the entire sub-surface fleet will have been replaced with new rolling stock, which will be known as S stock. The Metropolitan line will be followed by the Circle and Hammersmith & City lines, and finally the District line.
*Total train capacity is based on 4 passengers per m2