"Ugly, daft and pointless", eh? I was born and brought up in Darjeeling and them is fighting words!
Anyway. The "streamlined" B-Class was "inspired" by the Iraqi State Railways PC Class locomotive, and seems to have been a "diversion" created by James Shaw, the last British General Manager of the Darjeeling Himalayan Railway. Of course. it made no sense at the speeds on the line. And during the first run uphill, the nose cover had to be hinged back and wired open so that the sandman could sit in there with his bucket of sand.
From what I'm reading in David Churchill's recent (and excellent) book on the DHR B-Class, the streamliner required an extension of the frame by nearly three feet. It needed a tender (which probably still survives somewhere on the line) as there was no access to the traditional coal bunker under the casing. I'm not sure how it went back downhill - did they turn the thing (unlikely due to the gradients involved), or did they run tender first?
An oddball machine, but I'd stop short of calling it ugly - it is one of the fascinating parts of DHR lore. And I'm certain most would agree that the original B-Class certainly does not belong on this thread!
B-Class (probably 779) at Darjeeling Station, taken by me a couple of years ago.