You didn't mention is this was a 2-rail or 3-rail context, but feeding power into the closure rails on larger Ross turnouts prevents stalling. You take advantage of the Tortoise Motor "relay" contacts. Basically, you feed power into the unused closure rail (the one the wheels aren't rolling on) and energize them as a hot-lead extension, while putting the closure rail being used to common. This gives you full power through the turnout. If this is a 2-rail situation, you can just wire the closure rails to the corresponding main running rails since the frog is insulated.
Hope this helps.
