I have both a Lionel standard gauge Hiawatha (6-13004) and standard gauge Vanderbilt set (6-13008). They both have an early TMCC version in them, without cruise. I was reading about putting an ERR cruise commander "M" kit? I talked briefly with Scott Mann and he recommended I reach out to you guys to see if this would fit- saying sometimes lionel put different units inside them and he wasn't sure.
I see a post about 10 years ( https://ogrforum.com/...gauge-cruise-control ) where @NJCJOE used a cruise commander M?