Was this tram depot in Waldram Place?
I know the building in Waldram Place it is across the railway from Forrest Hill Station, I think that at one time it was an Electrical Generating building as it was so close to the railway it is most likely to be for the railway.
There were three places that the trams terminated, one outside the what was the Capital Cinema London Road, seem to remember the 72,
Another was outside the now named Crystal Palace Hall, Perry Vale, here the local tramways were owned by different companies, a turnig place was in Walram Place so this power plant may have supplied the electricity for the company coming from Brockley.
This is not the Tramway in my book.
If you wonder what was where just through the railway bridge the blue podtacabbins are now, it was the Council Depot, and a very handy Pulic mens Urinal.