Sentence:  Basically, heavy <WSD>unfitted</WSD> trains are hauled by ex-G.W.R, ex-L.M.R. or ex W.D. 2-8-0s and fast freights by "Halls" and "Granges", [...]. 
Meaning of the word marked with <WSD> tags:  Of trains, or wagons in the train, not having a through brake pipe, or brakes on the wagons that can be operated from the locomotive (the wagons did have handbrakes however).