This was one of the sturdiest and most beautiful class of locomotives ever built and is used on the steep gradiants of DHR. Four prototypes were built by Sharp, Stewart & Co. Atlas Works, Glasgow UK in 1889. 777 B class locomotive used to have its gracious presence in Darjeeling Himalayan Railways & was one of the four 1889-built prototypes and was in service till about 1952, now resting in National Rail Museum - New Delhi.