ČKD T-669 diesel locomotive

T 669 T 669 and others
T 669 at Durres station, Albania
Type and origin Power type Diesel-electric Builder ČKD Model T669.0 770 Build date 1968-1990
Specifications Gauge 1,435 mm (4 ft 8 1⁄2 in) – 1,524 mm (5 ft) Wheel diameter 1,050 mm (3 ft 5 in) Wheelbase 8,660 mm (28 ft 5 in) Length 17,240 mm (56 ft 7 in) Loco weight 115 t Fuel type Diesel RPM range 750 Engine type ČKD K 6 S 310 DR Cylinders 6 Cylinder size 310 mm × 360 mm (12 in × 14 in) Transmission DC Electric MU working yes
Performance figures Maximum speed 90 km/h (56 mph) Power output 993 kW

T-669.0 (770) class diesel locomotives, built by ČKD are six-axle, with two bogies. The wheel pairs are set in radius arms and have a simple coil spring suspension. The body is mounted on the frame with eight anchors. The locomotive is a hood unit type with an internal, eccentrically-positioned operator's cab.

Located underneath the front hood is the traction assembly – a K 6 S 310 DR diesel engine and a TD 802 traction generator – and auxiliary machinery powered by the diesel engine via a hydrodynamic transmission. Chillers and ventilators are located here as well. TE 006 traction motors are axle-mounted on the wheel sets. Located underneath the rear hood are batteries and a supply of sand.

After modifications of the seating of the hood on the frame, the T 669.1 (771) and the wide-gauge version T 669.5 (770.8) were created at SMZ Dubnica.

This class of locomotive, manufactured for Czechoslovak State Railways, Soviet Railways, and railways in Poland, Albania, India, Iraq and Syria numbers over 8000 units, making it the largest series of locomotives ever manufactured in the Czechoslovak Republic.