I've replaced the old RC car style remote with a mock in-cab control panel remote. The new controller is nice because you don't have to keep holding it while you use it, it floats like the toolbox. It also has more space so all of the different controls fit on it. I also added a speedometer and a first person view camera which makes it easier to drive out of view locos.
The new controller can be sommoned by pointing at a loco and pressing the menu button. Once summoned you can switch between all of the active locos.
https://www.youtube.com/watch?v=Z7CBJtuMHW4