The following is part of the description in the Lionel catalog regarding Legacy operation by using Bluetooth.
"LEGACY® Control System equipped – able to run in LEGACY® Control mode, in TrainMaster® Command Control mode, or in Conventional mode with a standard transformer
- Bluetooth® Control - Operate with Universal Remote or LionChief® App"
Do you need the Legacy base unit #990 to operate a Legacy engine with Bluetooth app on an Ipad or Android phone?