From memory only, I believe that Tony has announced that new versions of Trainz (don't know which recent release they will be based on - TS12, TANE but possibly not TRS19) are being prepared for Android and iOS. Release date unknown - "real soon now (TM)" is the often quoted expression.
Having just recently converted from a Windows 10 phone to an Android phone I can't say that the prospect of playing Trainz on the very small screen appeals to me. But maybe the experience would be different on a larger device such as an iOS or Android tablet.