MU Legacy engines with different speeds

The nice thing about most Legacy engines is they have back driveable gears.  This allows them to live with small speed differences. 

That seems like a huge difference in speed. What is that about 5 percent?

If they do indeed have backdriveable gears, I can't see this difference hurting them.  However, I believe Jon Z. from Lionel recently commented on mixing the older Legacy with the R4LC and the newer models with the RCMC, he stated they don't play that well together in an MU.

I posted this a few days ago on another thread.  I have noticed watching live streaming of long trains at BNSF and UP on the trains website at a double tracked diamond , they both use quite frequently power at the head, a helper midway and a pusher at the rear. Thought it'd be cool to try it myself.  Found it's a difficult exercise with MTH P-2 , impossible with TMCC  motive power without derailing RS  and its not in the cards with LC+.   However, with Legacy engines and Odyssey on,  here's a  SD40-2 at the front,  a GP-35 midway as a helper and a 8 year old GP30 in reverse as rear pusher pulling a 15 car train.   It ran fine at any speed.     BTW, I took 12  pieces of RS off the train to shorten the video...

Joe

Here's 115 cars with two Legacy U-Boats, one is in the lead, the second is midway in the consist.  The two U-Boats were working, but they made it around, including the 2% grade on one end.  Smooth as silk, no bucking or fighting between units.  At the end, you see the lead locomotive come back through the reversing loop and pass the tail of the train going the other way.

Here's a DCS set of F units on the head end and a set of Legacy helpers on the rear end. I did it at the club just to see if I could do it. A remote in each hand and controlling them separately, it did end up in a big wreck.... but that was my fault messing around with the Cab2 remote.