DigiTrains android app is now compatible with bluetooth HID gamepads. This way you can control your model railroad in the most realistic ways, especially if you have modern locomotives. Advantages:
-accelerate and decelerate with the joystick, just like in a real locomotive driving cab
-set direction and functions with buttons of the gamepad
-virtual driving cab with more function buttons, emergency stop and speed display in km/h and mph
-wireless control of your layout
I have a MOGA PRO bluetooth android gamepad. I am very pleased with it. You can get it on amazon.com. Other android bluetooth gamepads can be used as well.