The motor is wired incorrectly.
The black wire on the right from the reverse unit to the motor brush is wrong. It should go to one of the coil wires.
The red coil wire wire should not be connected to the brass terminal screwed to ground on the left side of the motor.
Connect the red and green coil wires to the left brush connection.
The red and green coil wires should be wired to the switch, one on each terminal.
Power in should go to the right brush connection.
Follow the wiring diagram and your loco will run.
Larry
