....sure that Pullmor was used in postwar/TMCC. ...”
Open frame motors were used on postwar engines, and later the "PullMor" was a featured motor, better than the older open frames. AC "PullMor" motors were used by Lionel in the TMCC engines from the 1990's (I have a couple of TMCC GP-9s), and even beyond 2000- for example the Century Club 773's had PullMor motors.
Later-issue TMCC locomotives began to feature DC motors, and Odyssey speed control. So- you can't say the TMCC products were all either PullMor or DC motor powered- they were a mix.
ONLY engines with a DC motor can have Odyssey- speed control. IMO speed control is a big feature, since it allows running on a fixed 15-18v AC; and that cuts way down on track power variations, and the speed you set is the speed you get.
Today as far as I know ALL Lionel (and other) three-rail locomotives are driven by DC can motors- the AC current from the track is converted to DC current onboard.
7/11 Added: If Lionel says "powerful maintenance-free motor"- as far as I know that's "Lioneleze" for a can motor/ vertical drive (China drive).