All of Lionel Mikados made since K-Line folded use the K-Line chassis with the small forward facing motor. That includes all the USRA Lights, Heavies, and the Hybrid. Chassis replacement options include MTH, Williams Brass, and the Lionel Southern type produced in the 1990s. None would be a drop in replacement and require considerable modification to accept the Lionel or K-Line shell. Its only because Lionel themselves made a new chassis for the B&A/B&M K-Line Berk that made Lou's and Pat's conversions doable with minimal modification.
Pete
