This is the left cylinder of steam locomotive -#802 "Victor". It is decorated with a wing, a bit like the -#791.
"Victor" is under maintenance at the Darjeeling yard, awaiting for new rods.
The Darjeeling Himalayan Railway, locally known as the "Toy Train", is a 2 ft (610 mm) narrow gauge railway that runs between New Jalpaiguri and Darjeeling (India). It is still operated by vintage British-built B Class steam locomotives. Operations between Siliguri and Kurseong have been temporarily suspended since 2010 following a Landslide at Tindharia (view photos of the landslide).
For more information about the Darjeeling Steam-powered Train, read en.wikipedia.org/wiki/Darjeeling_Himalayan_Railway.