I recently got a ZW-C and so now having enough power to do so, I wanted to put everything I owned on the track to see just how much some of my locomotives could pull. I had 40+ cars behind my K-Line GG1 with TMCC. I started pulling them just fine, but around a u-turn I pulled a bunch of cars off the tracks. After a repeat I could see that O36 track wasn't the best to try this on. Being all I had, I gave up on the single locomotive pull and decided to add a helper mid train. I tried my K-Line Allegheny first. I have learned from the forums to place both on the track apart from each other and create the train and see if they run at the same rate. The GG1 was the rear, and the Allegheny front of the lash-up. When I set it in motion, the GG1 took off and the Allegheny hardly moved. So I tried my son's HHP-8 with the GG1 and that worked fine for the train. Later I put the Allegheny and My K-Line Big Boy on the track and tried with them. The Big Boy was the lead with the Allegheny the rear. Now the Allegheny took off while the Big Boy crawled. This happened regardless if the Allegheny ran forward or backwards in respect to the Big Boy. Due to the lateness of the evening at this point, I didn't try swapping thing up anymore, but it's almost like the lead in TMCC lash-ups just doesn't go as fast as it would solo or in other MU positions. Have others see this?
As notes, I did do a AUX1-0 before moving out the lash-ups, and all locomotives are set at L for speed control. This was my 1st time ever trying a TMCC lash-up.
