As some folks have said, your engine is a Williams rendition of an E60. There were 4 axle and 6 axle variations even through the prototype was 6 axle.
One thing I always got a laugh out of was if Williams could slap a paint scheme on it they didn’t hesitate to! Off the top of my head I know they offered the E60 in Amtrak Phase 2, Virginian, Penn Central, Pennsylvania, Conrail, New Haven, Burlington Northern and I’m sure I forgot a few.
We’ve never had a scale E60 or E60MA in O. MTH did catalog them back in their 1999V3 I believe but it was cancelled. I worked with the fella from Pacific Northwest resins to develop and offer a near scale length E60MA shell (its 4 scale feet (1”) shorter than the prototype to fit on an SD60 chassis) using the Williams rendition as a starting point but that’s all we have.
I have mentioned to Scott Mann of Sunset Models a few times about the E60 as I believe it would be a good compliment to the scale length GGD Amfleet Cars. Perhaps if enough folks let him know the project would generate interest. With tooling costs these days you won’t see one of these from MTH or Lionel.
