I was thinking I was one of the lucky ones, since I run my new Lionel Legacy Alco PA in factory setting engine 1 I am not having the problems addressing the engines that a lot of people are experiencing. But....
Intermittently while running or when starting the rear unit would lose the signal, or so I thought, install causing the lead engine to try to drag it resulting in a horrible noise! I had assumed this problem was due to two of the rollers on the rear engine being stuck. They wouldn't roll and even after I lubricated them and played around with the pivot they still would not roll on the track. To test my theory I swapped out the two stuck rollers with two good ones from the other engine. To my surprise the problem kept happening. Usually the lead engine would pull the rear one along and it would get over it's momentary flicker. Only if they were going very slow would it stall out. So to try to figure it out I ran the rear engine by itself slowly around the track and sure enough when it hits a really tight curve (036 in this case) it will sometimes stall and the dreaded cab light starts blinking. Here is a video for you train detectives out there.Once I cut the power and give the engine a little shove on the track it starts right up again.
