SDD20 diesel locomotive is exported to Tanzania. Its axle load is 20t. It is equipped with 7FDL 12 cylinder diesel engine with electronic fuel injection, 5GTA43A main alternator, 5GE761A23 traction motor, narrow gauge radial bogie with three axles. The car body is of outside corridor. It adopts load-bearing fuel tank. It is AC-DC transmission diesel locomotive with vacuum–air braking system and BRIGHTSTAR microcomputer control technology. The locomotive is equipped with resistance braking device. It has the performance of self-load at all power and double heading in consist.
SDD20 diesel locomotive is developed and manufactured mainly under the consideration of the environment, climate condition and customers’ special requirements of railway transport in Tanzania. The locomotive adopts AC-DC transmission. Main components are manufactured by GE. The auxiliary transmission system adopts mechanical transmission. The air compressor is vacuum-air compressor with mechanical transmission. It adopts single redial console.
main technology parameters
Basic locomotive parameters:
Locomotive type:SDD20 Electric transmission diesel locomotive
Purpose:Mainline passenger, freight and shunting locomotive
Running conditions:
1) Maximum temperature:45℃
2) Minimum temperature:-10℃
3) Relative humidity:≥70%
4）Maximum altitude of areas throughout the route:1800m
Gauge:1067mm
Locomotive clearance limit:meet provisions of Tanzania railway( TZR locomotive and rolling stocks clearance limit)
Transmission mode:AC-DC Transmission
Axle arrangement:C0-C0
Wheel diameter:915mm
Axle load:20 ×(1±3%) t
Calculating locomotive weight with full service:120 ×(1±3%) t
Maximum running power of diesel engine:2460kW
Locomotive speed(calculated at half worn driving wheel):
a) Maximum running speed:105km/h
b) Continuous speed:26.6km/h
Locomotive tractive effort at the wheel rim:
a) Maximum starting tractive effort:313 kN
b) Continuous tractive effort:259.7kN
Minimum curvature radius negotiated:100m Light locomotive, speed is less than 5km/h
Wheelbase:
a) Wheelbase:1650mm
b) Total wheelbase of bogie:3300mm
c) Total wheelbase of locomotive:14235mm
Locomotive configuration:
a) Length:19500mm
b) Width:2900mm
c) Height:3960mm
Fuel tank capacity:9000L
Total lubrication oil volume of diesel engine oil pan:776 L
Total water volume:1100L
Total sand volume:800kg
Center line of coupler above rail top:(885±15 )mm