I don't know for sure since I've never had a Trackmaster Revolution set, but the older engines wouldn't be able to climb up steep hills on the new track because they were never good on slopes without traction ridges in them, and the new track is designed to fit the new, much bigger and more spread out teeth of new Trackmaster engine wheels, not the rubber traction tires with the many tiny subtle ridges. It wouldn't be able to grip the new track in the same way a new engine can't grip old track.
Creator of upcoming series "Sudrian Tales"
Amateur voice actor
Still haven't painted FFF's Daisy lol sorry my guy (i promise I'll get that airbrush kit soon)
Amateur voice actor
Still haven't painted FFF's Daisy lol sorry my guy (i promise I'll get that airbrush kit soon)