LocoTouch

This app can control a model railroad train by connecting to JMRI WiThrottle, Roco Z21, DSAir2, and LocoTouch Host. (LocoTouch Host is available in Japanese language version only).
Compatible to ESU Mobile Control II, and can control train speed by MC2's throttle knobs.

Details:
http://train.khsoft.gr.jp/lib/software/locotools/locotouch_e.htm