Is there any way to patch Trainz 2010 Engineers Edition to the multiplayer edition? I have the Trainz Simulator 2 pack, and installed Trainz 2010 Engineers Edition,
To be honest with you, it's not worth the hassle to patch it to the Multiplayer Beta, as it may no longer be working anyway in TS2010. Use your TS12 version for multiplayer instead.
You can still patch it as far as 44088 though - you will need to find out your current build version to do that (it's the 5-digit number on the Launcher screen).