Every once in awhile, an old AT unit of SD45 styling (I can't really tell all the different class distinctions. I have to look at the builder's plate or blue card) will be found with a longer 'nose' than others, and it will also have a small door near the handbrake. Opening the door will reveal an empty room where it is supposed to have had been equipped with remote control radio equipment. These units are still in service, but not seen very often.