Here are some examples of the later use of single trailer 50’ platforms for TOFC from the Piggyback Color Guides mentioned earlier.
Unfortunately I do not have any pratical way to post pictures of these cars.
ATSF, two photos, slighly different classes, converted from bulkhead flats in 1983, car numbers 293236-293334 and 293336-293433. Cars have straight sides, cushion underframes, side brake wheels, no bridge plates, hitch, inner rear wheel guides similar to the ConCor model.
ATSF, Ft-108, home built spline cars, converted 1984 thru 1986 from box cars, 299601-299683.
ATSF, Ft-105, also home built spline cars converted 1984 from box cars, 299029, quantity unknown.
CN 684012, photo taken 1977, 54’ flat with hitch and 40’ van.
CN684512 and CN685584, both 54’ cars built in the early 60’s for twin 26’ van TOFC, still use as of 1983 and 1986 for single trailer service respectively when photographed.
EL 7028, 1941 flat car, one of 12 converted to TOFC in the 60’s, still in service with a single 40’ van and trailer hitch 1973.
MP99390, still in service 1970, one of 95 cars built in 1938, and converted to TOFC in the early 60’s. These cars were an unusual 45’ long…
So, to repeat, be they older flats rebuilt again, or conversions from outdated 50’ box car frames, single trailer 50’ (+/-) seem to be reasonably popular in the 1980’s to handle 45’ vans.
And apparently a few struggled thru the 70’s…
And, it appears that that many railroads did not wait for TTX to solve the 45’ trailer problem, but rather invested in their own conversions and rehabs. So the TTX roster listings may not have much relevance on the number of such cars in service.
While I have a good background in TOFC in general, my main interest is earlier TOFC, so some of this is new info for me as well.
Possibly more latter,
Sheldon