A rail car mover attachment includes a remote removably mounted in a machine cab and including an emergency actuator to abruptly activate a rail car brake, a lock pin actuator to move a lock pin relative to a rail car latch in a rail car coupler, and/or a controlled stop actuator to selectively activate a rail car brake. The attachment can include an onboard compressor, such as a high volume compressor. The attachment can include a disconnect unit that self-activates rail car brakes if the attachment loses power or detaches from equipment. The attachment can include a light showing the attachment is charged and running or showing a fault. The attachment can include a laterally extending indicator arm deployable when the rail car coupler is fully attached to the rail car, and that extends beyond a rail car width so that a spotter can visually verify the coupler status. A related method of use also is provided.