Generally the passenger cars I have seen have 36 inch wheels. Intermountain does not make them as far as I know.
Also Intermountain only makes one style, needle point, and one axle length. They are great wheelsets and fit Athearn and Weaver trucks perfectly. I have also used them to convert MTH and Lionel cars but on some, they tend to be a little loose. They are too long for Red Caboose trucks and will not work in them.
NWSL makes wheelsets in multiple sizes and styles. As mentioned they make .172 wide treads, also .145 anI think .125. They make different lengths of axles for different trucks They also make both needle point and blunt end axles. So if you have a unique truck you want to preserve a special you can. Note that for MTH more than one axle length has been used.
