The electricity was generated at the LNWR's power station in Stonebridge Park and a depot built at Croxley Green.

[2] The second batch of trains, 38 three-car sets and 5 spare motor cars, used Swiss Oerlikon equipment and was generally similar to the Siemens powered stock.

The first class seating was in facing pairs arranged 2+1 on either side of the gangway, and the general ambience was Edwardian-luxurious, with mahogany panelling.

Above the seats were glazed frames which displayed photographs of landscapes and towns served by the London and North Western Railway; these were retained to the end.

[2] For operation on the extension of the Bakerloo line, the LNWR and the London Electric Railway (LER) ordered new Watford Joint Stock, but were delayed by World War I, not arriving until 1920.

[1] The electrification of the line to Euston was completed in 1922 and a further 75 three-car Oerlikon units and 3 spare motor cars were received.

In addition there was a substantial operation of Broad Street to Watford Junction trains via Primrose Hill, which shared significant sections of both main routes.

On nationalisation, over a period of about three years, they received Southern Green livery with the BR "cycling lion" emblem half-way along the lower side of the motor coaches and retained this until withdrawal.

[citation needed] At least two motor coaches, M28247M and M28282M, were rebuilt with flush panels and windows with large radius curves to the lower corners, giving them a more modern appearance.

The Siemens stock trains were stored after the withdrawal of passenger services over the West London Railway following bomb damage in 1940.