@The GN Man posted:The F3 A-B-A set was 8466/8475/8467. According to Lionel's engine numbering at the time, these were produced in 1974. No matching "O" passenger cars were available from Lionel, but IIRC Williams did offer some a year or two later. Those F3's couldn't pull much, as only the 8466 was powered and it was single-motored.
Yes, dual motored F-units would have been preferable, along with Magna Traction...after all, it had been done before.