I have looked at your posting several times and thought what i had to say might appear stupid ,anyway i have started so will finish.
Holbeck Railway sidings and Loco sheds ran behind a high wall on one side of Ninevah Road ,the other side being houses mainly demolished in the 1960s,this area was the target of bombing in WW II because of the railway's proximity.
Barracks -In modern thinking we would think immediately of Military ,Army in particular because of being land based.
The definition in The Oxford Dictionary says
Quote:-Permanent buildingin which soldiers are lodged,buildings in which others [e.g. children]are similarly herded together; building of severely dull or plain appearance.
Could this mean a building housing several families who had fallen on hard times? maybe provided by a railway charity? hence Loco being in the name.
Good luck, hope another suggestion is useful ,regards Trevor