John Wade says Notice the strange configuration of the conduit between the bottom marker lamps.Why? So the two hinged doors could be swung open to reveal the radiator elements ,but only after the middle marker lamp was swung down out of the way!! (The lamp iron itself, which the marker lamp was mounted on, was on a hinge. How do I know this trivia? I reinstated the conduit to D2587, at The Heritage Shunters Trust at Rowsley, and only discovered the reason while doing the job