Here are some rough cut videos of a 1946 726...
The first one shows a 726 running light ...the train is powered by Z-4000
Next video is the same 726 pulling the cars that came with it in the 1946 2114WS
set...also note I replaced the smoke bulb years ago with a 1156 automotive bulb and in the video I put 3 drops of Mega-steam down the stack...if you look close you
can see a little smoke.
The last video is a older one from a years back of the same consist pulled
by a 1947 or 48 version of the 726...this one does seem to perform better.
The 1946 version would probably perform better on Lionel tubular track but the 1947 version doesn't seem to mind the MTH track.