DF8I Diesel Locomotive

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DF8BI diesel locomotive is developed and manufactured for Iran national railway as a dual-purpose passenger and freight locomotive. It is equipped with 16V280ZJA diesel engine, JF204D synchronous main alternator and ZD109E traction motor. UIC standard operator cab and load-bearing fuel tank are employed. Three-axle bogie with rolling bearing U-tube and 23-ton axle load is designed as the running gear. This locomotive has double microcomputer control system and dynamic braking equipment. It has full-power self-loading and double-heading functions. The JZ-7 air braking is adopted for the locomotive air braking system. The locomotive is equipped with automatic couplers in accordance with Willison profile and the installation position of buffer is reserved. The top air-intake structure is employed and air filter system under UIC clearance is optimized to prevent wind and sand. Measures to minimize weight from the GE design concept are understood and absorbed. The capability for the locomotive to negotiate a curve of small radius is improved in the design. It can be allocated as locomotive in consist as well.

Model	DF8I
Gage	1435mm
Locomotive clearance	UIC 506-GC
Transmission mode	AC-DC transmission
Axle arrangement	Co-Co
Wheel diameter	1050mm
Axle load	(253±0.69) t
Calculating locomotive weight with full service	(138±4.14) t
Nominal power (under UIC conditions)	3100kW
Maximum service power of the engine	3680kW(Under UIC conditions, the engine power can be corrected in accordance with the formula in ISO 3046-1 at high temperature and high altitude.)
Maximum test speed	110km/h
Maximum running speed	100km/ h
Continuous speed	28.2km/h
Maximum starting tractive effort	520kN (calculated at the traction motor) 440 kN(calculated at the adhesion))
Continuous tractive effort	80m (single locomotive, speed less than 5km/h)
Minimum curvature radius negotiated	145m
Wheelbase	1800mm
Total wheelbase of bogie	3600mm
Total wheelbase of locomotive	15900mm
Locomotive configuration (L×B×H)	22000×2950×4650mm
Fuel tank capacity	9000L
Total oil volume	1200kg
Total water volume	1200kg
Total sand volume	600kg
Center line of coupler above rail head	(1040-1045)mm

Basic locomotive parameters:
1.Gage: 1435mm
2.Locomotive clearance: UIC 506-GC
3.Transmission mode: AC-DC transmission
4.Axle arrangement: Co-Co
5.Wheel diameter: 1050mm
6.Axle load: (23卤0.69) t
7.Calculating locomotive weight with full service: (138卤4.14) t
8.Nominal power (under UIC conditions): 3100kW
9.Maximum service power of the engine: 3680kW (Under UIC conditions, the engine power can be corrected in accordance with the formula in ISO 3046-1 at high temperature and high altitude.)
10.Locomotive speed (calculated at half worn driving wheel):
a)聽Maximum test speed: 110km/h
b)聽Maximum running speed: 100km/h
c)聽Continuous speed: 28.2km/h
11.Locomotive tractive effort at wheel rim:
a)聽Maximum starting tractive effort: 520kN (calculated at the traction motor) 440 kN(calculated at the adhesion)
b)Continuous tractive effort: 369kN
12.Minimum curvature radius negotiated: 80m (single locomotive, speed less than 5km/h)
13.Wheelbase:
a)Wheelbase: 1800mm
b)Total wheelbase of bogie: 3600mm
c)Total wheelbase of locomotive: 15900mm
14.Locomotive configuration:
a)Length (center-to-center distance between couplers): 22220mm
b)Width: 2950mm
c)Height: 4650mm
15.Fuel tank capacity: 9000L
16.Total oil volume: 1200kg
17.Total water volume: 1200kg
18.Total sand volume: 600kg
19.Center line of coupler above rail head: (1040-1045)mm