Recently I'm trying to cease bugs in my modpack, and I noticed that:

• Locomotive with lamp lit occasionally changes the rail turnouts under it, as if an "redstone off" signal is sent to it (more likely the locomotive just replaces the rail under it with some kinds of "glowing rail", since middle key duping no longer works)
• The lamp goes out when the locomotive is on rails from other mods (from More Minecarts and Rails, luckily it doesn't replace them with glowing rail stuff) EDIT:as well as vanilla powered/detector/activator rails
• The locomotive doesn't go faster on their premium rails

It'll be great if the two vanilla+ minecart/rail mods go along well :) and greater if the lamp-on locomotives won't change the rail.

One more thing: The connected carts occasionally become unconnected