Earls Court early 20th century

Could that second image be starting the construction of the stairs down to the Piccadilly line escalators?

It is a bit knackered isn't it? When I looked just now I was able to view all the thumbnails but when I clicked on one, nothing happened at all.

The caption to the photo says the work in progress is to replace the wooden platforms with concrete and that the flatbed wagons are being drawn by a diesel locomotive. However, this caption must surely be incorrect. Practical diesel locomotives were not developed until after WW1.

It looks to me like a maintenance vehicle, with separate compartments for tools (the bit nearest the camera, with the hatches on the top), crew (in the middle) and an open section (at the far end)

EDIT The open section may be a separate wagon - the man standing by the cab obscures whether there is a gap or not. I now understand the hatches probably cover a battery compartment.

Believe it is an early battery loco later converted to electric traction. L8 and L9 ring a bell. They carried wheels in later life I believe.

Look what I've found
www.districtdavesforum.co.uk/thread/27394/l8-press-cutting-july-1958

Built 1909 (so the date in the LTM caption is wrong) Originally numbered 19A, 20A.
Lost their batteries during WW1 to become straight electrics.
Renumbered L8, L9 in 1929.
Rebuilt in 1958 with Q stock traction equipment.
Withdrawn in 1969.

That's brilliant, thanks - for such long lives there seem surprisingly few photos.