I haven't found many picture either but found this description that may help.
'As stated TOFC was the most common well into the '80s, then came double-stack. TOFC Ramps were all over the place. they could be built very cheaply and loading only required a short wheelbased tractor (hostler). MoPac had one on the St. Louis riverfront near Poplar Street that was a cut off end of a flat car, truck and all, blocked on timbers. An earth filled ramplead up to it and had ties for side walls.'
Cheers
Darren