The darjeeling himalayan railway which is also known as a toy train runs between new jalpaiguri & darjeeling . Running on the narrow gauge it was built between 1879 & 1881 . The distance is around 78 kilometers with 13 stations enroute . The most interesting part is that it travels over the elevated terrain from 100 meters to 2,200 meters . The most outstanding example of a hill passenger railway. It’s designed applies bold and ingenious engineering solutions in connecting beautiful mountainous terrain . This unesco world heritage site railways has a station named ghum which is the highest railway station in india. All the three railways are fully operational till date .