The DD-51 Diesel Hydraulic Locomotive, manufactured by Nippon Sharyo, is a proven workhorse built for heavy mainline and industrial rail duty. Powered by two DML61Z 12-cylinder diesel engines each rated at 1,000 PS at 1,500 RPM, the DD-51 delivers outstanding pulling power with a maximum tractive force of up to 18.0 tons at 15-ton axle load.

Featuring a B-2-B axle arrangement with three-stage hydraulic transmission (DW2A x 2) and automatic changer, the locomotive ensures smooth power delivery across varying operational conditions. The DD-51 operates on 1,067 mm gauge track and is convertible to 1,000 mm, making it versatile across Southeast Asian and international rail networks.

With a maximum operating speed of 95 km/h, DL14A air brake with hand brake, and a robust total working weight of approximately 84 tons, the DD-51 is engineered for long-term reliability and operational excellence.

Specifications

·       Model: DD-51

·       Manufacturer: Nippon Sharyo Manufacturing 

·       Track Gauge: 1,067 mm (Convertible to 1,000 mm)

·       Axle Arrangement: B-2-B

·       Total Weight Working Condition: ≈ 84.0 Tons

·       Total Weight Empty Condition: ≈ 76.0 Tons

·       Driving Axle Load Working Condition: ≈ 14.0 Ton – 15.0 Ton (With 2 stage change-over switch) Wheel Diameter: 860 mm

·       Max. Speed: 95 km/hr at wheel dia 780 mm

·       Max. Tractive Force at Axle Load 14 Tons: 16.8 Ton

·       Max. Tractive Force at Axle Load 15 Tons: 18.0 Ton

·       Q'ty of Diesel Engine: DML61Z x 2 Engines

·       Q'ty of Cylinder x Stroke: 12 – 180 mm. x 200 mm

·       Rating Rotation: 1,500 r.p.m

·       Rating Output Force: 1,000 PS 

·       Q'ty of Hydraulic Transmission: DW2A x 2

·       Transmission Type: Three stage with auto changer, filling and empty type with reversing gear 

·       Max. Torque Ratio: 5

·       Reduction Gear Ratio: 3,505

·       Brake Equipment: DL14A Air Brake with Hand Brake

·       Circuit Voltage: DC24V

Dimensions

·       Max. Width: ≈ 2,970 mm.

·       Max. Height: ≈ 3,956 mm.

·       Length between Couplers: 18,000 mm.

·       Length between Front Axle and End Axle: 14,340 mm.

·       Dimension between Axles on Driving Bogie: 2,200 mm.

·       Dimension between Axles on Center Bogie: 1,600 mm.

·       Dimension between Driving Bogie: 12,140 mm