Time for a model switcher blast from the past.
What you're looking at: An HO scale "Lindberg Lines" SW600 (closer to an SW1) that was offered by Lindberg from the very late 1950s to about the mid-1960s. In this example, it's in Baltimore & Ohio livery. Get this: The Lindberg Lines SW has a large flywheel, is belt driven, and uses NMRA RP-25 wheel contours. It was WAY ahead of its time!