Indian locomotive class YDM-1

The Indian locomotive class YDM-1 is a class of diesel-hydraulic locomotive developed in 1954 by the North British Locomotive Company for Indian Railways. The designation denotes a metre gauge (Y) diesel (D) mixed traffic (M) locomotive of the first generation. Twenty were built between 1954 and 1956, among the first metre-gauge main-line diesels in India, and they entered service in 1955. Originally called the DY class, they were imported to haul goods and passenger trains on Western Railways around Gandhidham, where water for steam locomotives was scarce, and were based at a diesel shed built there. CLW replaced their engines with Maybach engines around 1975. They served both passenger and freight trains for over 46 years, and all 20 have been withdrawn, with three preserved at locations around India.