I have the Virginian that came TMCC/RS4.0 and fan driven smoke. I purchased a K-line Cruise kit an installed it. Runs and smoke great. I have a friend who has the C&O that came factory with TMCC Cruise.
Here are some pictures against a set of PE passenger cars and pulling PW N&W hoppers. Also have a 28000 series Lionel TMCC Hudson in front. This is the 2000 version very similar to the PW 2056. The K-line could be a little taller, but it certainly is a nice fit on an O-27 layout. G