A bit of a niche industry -
Brixton was home to the London County Council Tramways, and later London Transport ticket printing and ticket machine maintenance works.
Effra Road printing works. A female worker works on a wire stapling machine that bundles the tickets into batches of fifty ready for dispatch.
Photographed by Richard Sharpe, 1949
This building was on the site that's now Halfords etc.
John Stephens (left) and George Sawyer (right) carrying out maintenance work on some Gibson ticket machines at Stockwell Works.
Photographed by Colin Tait, Feb 1955
In LCC days, and until the mid 50s, when the use of 'bell punch' tickets ended, the Effra Road site concentrated on printing, the 'Stockwell' site was on Stockwell Road, Brixton, and concentrated on ticket machine repair, although in LCC days, ticket punches were made there as well. The prototype 'Gibson' ticket machine was probably made there to the design of and under supervision of Mr George Gibson who was the works superintendent. (the production model was made in Tring, Herts)
I am trying to nail down the exact site of this, it is on record as being part of a former horse tram depot, but there were 2 such sites on Stockwell Road.
At some point in the 1950s, both functions were concentrated on the Effra Road site which was reconstructed after war damage. The works closed in the late 1980s as privatisation / outsourcing became policy.