Kenny which area are you in?
From my experience most trains in central Scotland have a bar (a bit like a sheffield stand but on it side and smaller). The arms of this have corrigated rubber to hold the toptube of the bike and they are straps also to hold the bike. A couple of times I've come accross another type where bikes are held vertically by hooks and strap like solty says.
Edit the pic was taken with my mobile so the quality of the pic aint good.