This past weekend the London Transport Museum held an open weekend at its Acton Depot where they keep a collection of trams, trolley cards, buses and underground trains, plus all the associated equipment. They only open the depot twice a year so this was a chance to see some things that are rarely open to the public.
I didn't include this museum in The Geek Atlas but after a visit it's likely a candidate for a volume 2 since it is packed with interesting stuff.
Like a really big collection of old underground signs:
Or shielding used while constructing the tunnels for the London Underground:
And speaking of the Underground, here's a power control panel with meters indicating hundreds of amps and some serious on/off switches:
And a lovely mercury arc rectifier used to turn AC into DC (the Underground uses 630V DC power).
And here are the wheels of a 1930s trolley car:
And here's the control panel from an Otis elevator:
But the highlight was a ride on the prototype Routemaster RM-1 bus. I forgot to photograph it, so here's a picture from Wikipedia: