The YDM-4 is a class of diesel locomotives operating on Indian Railways. The first units were built by the American Locomotive Company (Alco) in 1961. Since 1968, members of the class have been manufactured in India by the Banaras Locomotive Works (BLW), Varanasi. The model name stands for metre gauge (Y), diesel (D), mixed traffic (M) engine.

2017年2月11日 · Unlike the broad-gauge designs, the YDM4 was fitted with an ALCO 6-cylinder in-line 251-D engine, which gave 1350 hp and a brake horsepower in the range of 1100–1200 hp. Without any competition from electrics, this locomotive continued to hold its dominance over the vast meter-gauge network in India.

Fit for operating in 3ft 3in (1000 mm) meter-gauge sections of Indian railways with permissible axle load upto 14t. Alco design single piece cast steel frame trimount Co-Co bogies with asymmetrical arrangement of traction motors. Panel mounted IRAB-1 …

The India YDM4 class were Indian Railways' workhorse diesel locomotive. The first of the units were imported fully built from the American Locomotive Company (Alco) in 1961. Since 1968, it has been manufactured in India by the Banaras Locomotive Works (BLW), Varanasi. The model name stands for metre gauge (Y), diesel (D), mixed traffic (M) engine.

2015年3月17日 · Co-Co diesel electrics originally from Alco (1961-1964), later manufactured by DLW (1968-1993). The initial batch of 55 from Alco were used for evaluation and comparison with a similar batch of General Motors locos. The Alcos were chosen as the preferred MG main-line diesel locos. Alco model is DL535A.

Sheldon Perry provided this list of the metre gauge Alco's (YDM4's) assigned to the Western Railways:

The YDM-4 is a Co-Co diesel electric locomotive originally manufactured by Alco between 1961-1964 and later by DLW between 1968-1993. It has a maximum speed of 100km/h and is powered by a 1350/1200hp Alco 251B-6 or Alco 251D-6 engine.

YDM4 is a 1350 hp ALCO designed diesel locomotive. It is the main work horse of entire Metre Gauge (MG - 1000mm) Sections of INDIAN RAILWAYS. Due to the unigauge policy of INDIAN RAILWAYS, the MG tracks are now converted to Broad Gauge (1676mm).

2024年6月23日 · YDM4 #6130 to #6198 were built by Montreal Locomotive Works (MLW) in 1964 under the license of ALCO and were classified as YDM-4A. All the YDM-4 delivered up to then were presumably based at three premier DLS across India namely Siliguri (SGUJ), Ponmalai Goldenrock (GOC) and Sabarmati (SBI).

Description WDM2 WDM3A WDG3A WDP1 YDM4/4A WDP4 WDG4 15) Tractive effort Maximum in KGs 28050 28050 37884 18935 27550 53000 16) Adhesion 27% 27% 30.8% 26.3% 43% 43% ... Alco model Handle with TH/DB and reverser handle UIC model hand wheel with TH/DB and reverser handle UIC model hand wheel with TH/ DB selector and