Indian locomotive class WDM-1
 The 1st class of Wide Gauge(W) Diesel powered(D) Mixed load(M)i.e. meant for hauling both freight and passenger trains. These are the first mainline diesel engines imported after Independence. They were even the fastest diesel locomotives till the advent of WDM2 and WDM4. They used to haul ore/freight trains on SER. In the end they were relegated to shunting/piloting duties or hauling sugarcane freight trains. One unit is preserved at National Rail Museum Delhi.