I have upgrade a Gas Turbine, the Veranda Turbine, and now I have recently completed a Coal Turbine Upgrade. While plenty of room, the trick on this one is tether connection from the Lead A to B unit. This engine doesn't have traditional Truck blocks to add the tether connection. It has 4 pin draw bars. Because the way this long engine maneuvers around curves, the tethers have to come out via the trucks, not shell in my opinion.
I had to modify the B unit harness to remove the protective rubber and replace to route through the pilot truck. I also had to modify the lead unit harness, using a Diesel kit longer harness and a modified draw bar.
Here are some pictures. Love the sound of the turbine spinning up on this sound file. G