S.E.R Q class loco and crew

‘Q’ class 0-4-4 tank-engine number 136 is about to leave Westerham pulling a ‘birdcage’ set of coaches. This peculiar term was used to describe coaches with the little top-light window that the guard would use with a periscope viewer to look at the state of signals ahead – not so easy for the engine crew in all weathers running tender-first on the return journey.