I have one of their track cleaning cars. I run it behind the caboose at the end of a train for daily maintenance. I use 91% iso-propyl alcohol on the roller pad. It could be a little heavier. My came with a MT coupler on one end and a Rapido on the other.
I also have Tony's track cleaning car. It does a better job because it's much heavier weight wise. I only use Tony's CMX Clean Machine about once a month.
The Center Line car is good for routine everyday maintenance. I also run the padded roller dry after the wet runs.
Stay cool and run steam......