WDG-3A - GENERAL DATA OF WDG-3A LOCOMOTIVE ( WDG3A लोकोमोटिव की सामान्य जानकारी )

GENERAL DATA OF WDG-3A LOCOMOTIVE



WDG3A Diesel Electric locomotive 

W – Broad gauge 
D - Diesel Engine 
G – Goods Service 
3A –Engine Horse Power -3100 HP 

This loco is having up rated Diesel engine fitted with fuel efficient kit, Napier or GE make TSC, incorporated IRAB1 and facilitated with AC – DC transmission. 

Main compartments of WDG3A Loco from short hood to long hood 

1. Nose compartment 
2. Loco Pilot cab 
3. Control compartment 
4. Alternator Room 
5. Engine Room 
6. Compressor Room 
7. Radiator Room 
8. Under truck 


Short hood - Nose compartment end is called short hood. 

Long hood - Radiator room end is called long hood. 

Loco Right and Loco left - In loco pilot cab when you stand and facing towards nose compartment, your right hand side is loco right and your left hand side is loco left. 

Engine right and engine left - In loco pilot cab when you stand and facing towards engine room, your right hand side is engine right and your left hand side is engine left. 

Power take off end - In engine room alternator end is called power take off end. 

Free end - In engine room compressor end is called free end. 

Note- 

1. Counting of parts of Alternator room, Engine room and compressor room as per Engine left and Engine right. 

2. Counting of parts of Locomotive parts from short hood to long hood. 

3. counting of parts of Engine from free end to power take off end. 



Different major parts in compartments 

1. Nose Compartment 

Dynamic Braking Blower motor ( BKBL)        Dynamic braking Grids 

NS-1 Reducing valve and its COC                   Battery knife switch (BS) 

Control Reservoir with drain cock                   Horn and wiper COC 

a. On brake panel 

MU2B valve, 3/4” COC, C3W distributor valve, F1 selector valve, C2 relay valve, Addl. C2 relay valve, N1 limit valve, D24B valve, 24AD check valve, EPG pressure switch, EPG COC, MR pressure gauge, Power cut off pressure switch, Air flow measuring valve, 1¼” COC, Duplex valve, EPG toggle switch, 110 cubic inch reservoir. On outer wall of Nose compartment head light, flasher light marker light and multiple unit jumper couples are provides. 

2. Loco Pilot Cab 

a. On both control Desk 

A-9 valve with COC                                              SA- 9 valve with COC 
Master Handle (MH)                                             Selector Handle (SH) 
Reverser Handle (RH)                                          Load meter 
Brake pipe Pressure Gauge                                  Air flow indicator 
MR pressure Gauge                                              BC pressure gauge 
Lighting switches                                                  Speedometer 
Head light switch (HLS)                                       PATB 
Flasher light control box                                    Foot paddle switch 
Multiple unit shut down switch (MUSD)             Sander push button 
Master Fuel pump Breaker (MFPB)                 Main control breaker MCB 
Generator Field cut out switch (GFCO)            Indication Lamp panel 
Horn push button 

Other than above Loco Pilot Cab has Emergency flap valve, Hand Brake, Wiper servo motor, Dom light. 

b. On front panel wall 

Cab light circuit breaker                            Head light circuit breaker 
Engine room light circuit breaker              Dom light circuit breaker 
Cyclone motor circuit breaker                   MB-1
MB-2                                                         FPB 
AGFB                                                        CEB 
Alarm push button                                     ECS 
GR1                                                           GR2 
Alarm gong                                               MCO 
Indication panel                                        Start button 
Stop button                                               GFOLR reset button 

3. Control Compartment 



4. Alternator Room 

Traction Alternator,                                                     Auxiliary Generator, 

Exciter Generator,                                                         FTTM, 

Generator Gear Case and its dip stick gauge,                rectifier panel. 

5. Engine Room 

251-B up rated with fuel efficient kit type diesel engine 

Fuel injection pump, High Pressure Line, Water Jumper pipe, Water riser pipe, Inlet elbow, Exhaust elbow, Exhaust manifold, Cross over pipe 

On engine right side 

Engine Governor, Tacho Generator, Lube oil Dipstick gauge Crankcase Explosion Door , Primary filter, Secondary filter, OSTA Fuel oil Relief valve, Bubble collector, Lube secondary Header, Centrifugal filter, Right side fuel oil gallery 

On engine left hand side 

Crank case Exhauster Motor& Blower, Fuel oil Regulating valve Lube oil strainer, Bubble collector, Lube oil Main Header Lube secondary Header, Left side fuel oil gallery 

On free end 
Turbo super charger, After cooler, Water pump ,Lube oil pump 

6. Compressor Room 
Compressor unit, Cyclonic filter, Fuel pump motor(Fuel pump, Gov. pump), Water drain cock, Car body filter, ETS-1, 2, 3. 
Water temperature gauge, LWS& its Test cock, Lube oil relief valve Lube oil regulating valve, EPG’s EP valve and its COC with dirt collector 

7. Radiator Room 
Lube oil filter drum and its drain cocks Lube oil by pass valve Lube oil cooler Radiator core Radiator fan Rear Truck Traction Motor Blower (RTTM) Expansion tank no. 1&2 Right Angle Gear Box Eddy current clutch coil (ECC) On outer wall of radiator Room Head light flasher light, water level gauge, marker light and multiple unit jumpers are provided. 

8. Under Truck 
CO-CO high adhesion                                     bogie Front truck 
Rear Truck                                                      Center Pivot 
Side load Bearer                                             Helical Spring 
Vertical Shock absorber(08)                           Horizontal shock absorber (04) 
Equalizing beam                                              Axle Box 
Compensating beam D                                   shackle (08) 
Axle Journal                                                   Traction motor  
Nose pad                                                         Pinion Gear 
Axle Gear Traction                                        Motor Gear case 
Brake cylinder                                               Brake assembly 
Wheels Sanding                                              Arrangement 
Rail Guard                                                     Cattle Guard 
Pipes of Brake                                              System Buffers 
Center Buffer coupler                                  Fuel Tank 
MR Tank                                                     Axle Generator 
Mechanical speedometer                           sensor Hand brake chain 
Bogie COC 

Front Truck Traction Motor Blower (FTTM)

 Location – Alternator room Function – To cool Traction motor no 1, 2 and 3 by air, its shaft having 43 teeth gear which is driven by Main Alternator bull gear. Incase of abnormal sound from FTTM, fail the loco. 

Rear Truck Traction Motor Blower (RTTM) 

Location- Radiator room Function - To cool Traction motor no 4, 5, and 6 by air. It shaft is having a pulley which has 6 “v” belts, these belts are driven by a pulley on extension shaft No. 2 Minimum 4 belts are required. Engine must be shutdown to check the belts and its tension. If the number of belts is less then 4, fail the loco.