Dear Lionel - please consider this feature in your next upgrade. I run 6 to 8 trains at the same time. Several of them are individual engines and several are multiple unit consists.
Because of space limitations on the layout, I have to be very quick about cycling through starting and getting trains up to speed - cycling through them in order on the track quickly to avoid losing spacing or crashing. I don't mind terribly doing so one time per operating session but when the inevitable derail, or uncoupling, or engine stall happens, you end up having to do that a couple times a session.
I would like a feature where you could get all consists and engines you are actively running to listen to one speed from one ID. Then you could switch over to your train and engine IDs individually to operate after they are all in motion.