It's a normal self-generating coach. Only the control cables from the locomotive are run upto the end of the train and a duplicate loco cabin created on one side of the SLR to let the LP control the loco from this cabin.
Thanks. But if you see the first pic - on the other end there is a frame which looks like it will hold rear-view mirror. This component I did notice was cylindrical. Like a small exhaust tube with a nozzle on top. The train had started to move, so couldn't take a closer look.