#1 not all BEEPs are equal. There were different chassis, different designs that all still used the same shells, but mechanically internally could be night and day different. Example, there were single can motor versions that had crown gear for a reduction. Even just variations in the reverse unit change the basic speed of the engine. https://ogrforum.ogaugerr.com/...s-what-type-of-motor
#2 any engine on 031 tight curves is going to experience the drag of the train. Especially depending on what cars you are pulling.
#3 pop the shell off and show us what you really have.
It's just way too much to list or play the guessing game. Is yours missing the weights? What chassis is it exactly? Does it have a traction tire or traction tires? How clean is your track? How much drag are your cars?
