AJ - I know it's new and probably not consider a collectible but was looking for some wooden train stuf for my little boy and found this: http://www.amazon.co.uk/Bigjigs-Wooden-Railway-Sentinel-Train/dp/B003YLLBOG/ref=pd_sim_sbs_k_h_b_cs_29 please log in to view this image The last Sentinel train made at the shrewsbury works in 1957 in wooden form
One similar still running.Rolls-Royce Sentinel Cattewater, now at the East Somerset Railway. http://en.wikipedia.org/wiki/Sentinel_Waggon_Works I vaguely remember a few steam ones running on British Railways in the late 50's.
oh it is loverly in midland livery. aj prefers it in brunswick green or cambrian black. good luck in hunting for some wooden wagons etc.. i made a couple of wooden model stations at school, in beteen trainspottin at shrewsbury sheds and station