The Loco Story :

Built by Diesel Locomotive Works, Varanasi first in 1968.

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 brake system. Air, hand & dynamic brake.

The initial batch of 55 from Alco were used for evaluation and comparison with a similar batch of General Motors locos.

The YDM4A is a variant of the YDM4 supplied by Montreal Locomotive Works (MLW) first in 1969. Originally equipped with vacuum brakes. Some were later equipped with dual brakes

Technicalities :

Engines --- Alco 251B-6 (Alco/MLW), Alco 251D-6 (DLW); 6 cyl., 4-stroke, inline

Transmission --- Electric (DC-DC, in contrast to most other locos that were AC-DC).

Axle Load --- 12 tonnes

Gear Ratio --- 92.19

Power output --- 1350 hp

Bogie type --- Co-Co trimount

Max speed --- 96 kmph

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