Thanks! Yes, the CR Geep 9B's had horns. There is reason for the circle windows where the cab would be. If the B unit, had to be moved in and around the yard. The engineer would just open up the door and the unit controls was there. The engineer just had to poke his head out. Hence the reason why there was headlights. The Geep 9B's never lead a train.
When I did modeled the unit. I didn't know where exactly where the horn was place. But it gives a rough figure where it would have been.