I pulled out my Bachmann On30 locos. There are two different 4-4-0 locos. And the two are very different. WB is close but not the same, the oitside frame version is almost twice the size as the inside frame 4-4-0. The inside frame is more traditional looking loco while the outside frame loco is a bit odd looking to me.
Outside frame 4-4-0
Inside frame