What transmitter and receiver do you recommend to purchase to be compatible
Those are standard servos, and any r/c receiver will accept the plugs and control them. You can buy a cheap aircraft stick r/c system with receiver from many suppliers (Tower Hobby, Servo City, HobbyKing.)
Like Winn, I use an RCS TX3 handheld from Tony W. It is DSM2 compatible and much easier to hold and to control a train. RCS receivers are good, but any DSM2 type seems to work - I have tried and use Orange, Spektrum and a no-name $6 unit from China. Industry standards are great!