Z REVERSE No.1 (ZIG ZAG RAIL LINE) of Darjeeling Himalayan railways .A heritage site

"On the way from New Jalpaiguri to Darjeeling, the first z-reverse of this section falls exactly 2 kilometers away from Rongtong, which you are seeing in this video. There are a total of 6 z-reverses on the Darjeeling Himalayan Railway, out of which the smallest z-reverse is number 4.
In this video, you are seeing the z-reverse from the outside.