MTH RailKing items are compressed. As stated, the crane is quite high and tonnage is kind of irreverent. MTH assigns a name to many items, and in some cases, doesn't make it so.
Unless you have both models sitting on a track in front of you, guessing is just an assumption, not a fact.
The Lionel true “O” scale MOW cars are quite beefy. If you desire to mix apples & oranges together, go for it. I would stick with MTH Premier for those work cars in order to do it right. Don't forget, you will also have to choose a true O flat or gondola to support a crane as well. Non detailed, compressed RK's wont look right.
