I had two engines, one MTH and one K-line, for my rather heavy K-line Surfliner set.
The MTH engine was too slow even at full voltage. So into the "stuff I don't plan to run in this lifetime" box where it landed next to an old Rivarossi 2 rail Erie Built.
The truck spacing were identical ! So now I have a great running Mtharossi Eire Built, and not one visitor has commented on the wrong trucks.
When you live 4000 miles from the nearest LHS you have to go with you have.