Older Lego trains use IR for control so if you just want to control motors and lights, you can get one of those and control it with the IR blaster on the Flippe

Older Lego trains use IR for control so if you just want to control motors and lights, you can get one of those and control it with the IR blaster on the Flipper. If you also want the sensors/newer programmable hub, then you need the BLE protocol.