Bescot and Tyseley had purpose built, what we called Diesel Depot, type buildings. As far as I know Saltley only had the three road servicing/fuelling through "shelter". The roundhouses were used up until at least 1971, possibly later and then there were just stabling sidings, as far as I can remember.
And crimes of crimes, Bescot steam shed was demolished in 2013. It had been unused for decades.