This loco is designed for mixed service.

 General data

Engine Horse Power                                  2600 HP
Loco Horse Power                                     2400 HP
Maximum Speed                                       120 km/h
Weight                                                       112.8
T Axle Load                                              18.8 T
Tractive Effort                                           30.5 T
Brake System                                             28LAV1
Transition                                                   30, 50, 80 km/h
Generator                                                   DC
Type of Diesel Engine                               251B
Engine Idle Speed                                     400 rpm
Engine 8th notch Speed                            1000 rpm
OSTA Setting                                            1130 ±20 rpm
Power Contactor                                        9
Reverser                                                     2
BKT                                                           2
Center Pivot                                               2
Side Load Bearer                                       4
Length of Loco                                          17120 mm
Buffer height                                              1030-1105 mm
Locomotive Driving                                   Right Hand
Bogie                                                          Co-Co Type Trimount
Traction Motor                                           DC Series Motor
Engine Governor                                        EH / WW
Crankshaft Overlap Period                         123o
Locomotive Series                                      16, 17, 18

Main Compartments of WDM2 Loco

1 Nose compartment.

The following equipments are provided

Battery knife switch                 BKBL motor

VA1B Control                           Valve Vacuum check

valve                                          GD80D Filter

GD80E Filter                             2 Sand Boxes Banking COC

COC with strainer                      A1 Differential Pilot Valve &COC

On the outer wall of Nose Compartment Head light, Marker light, Flasher light and multiple unit jumper cables are provided.

Compartments of WDM2 Locomotive

 1. Nose Compartment 

Battery knife switch (BS)                                           VA1 B Control valve
Dynamic Braking Blower motor ( BKBL)                VA1 Release valve
Dynamic braking Grids                                              Vacuum check valve
GD-80D Filter                                                            GD-80E  Filter
Banking cutout cock                                                  COC with strainer
Two sand boxes                                                         Horn and wiper COC

A-1 Differential pilot valve, its COC and reservoir

NS-1 Reducing valve and its COC

Control Reservoir with drain cock

On outer wall of Nose compartment head light, flasher light marker light and multiple unit jumper couples are provides.

2. Loco Pilot Cab 

On both control stand 

A-9 valve                                                 SA- 9 valve

Throttle Handle (TH)                              Selector Handle (H)

Reverser Handle (RH)                             Load meter

Vacuum Gauge                                        Lighting switches

Head light switch (HLS)                           Flasher light control box

Indication Lamp panel                             Horn & Sander switch

Brake pipe or Brake cylinder Pressure Gauge

Auxiliary Reservoir and MR pressure Gauge

Multiple unit shut down switch (MUSD)

Master Fuel pump Breaker (MFPB)

Generator Field cut out switch (GFCO)

Main control breaker MCB

On Right Control                                                 On Left Control Stand

HS4 valve                                                             HB5 valve & its COC

Vacuum control pressure gauge                            PCS

MU2B Valve                                                         H5A valve& its COC

F1 selector valve                                                   Electrical speedometer

Wheel slip buzzer                                                  Mechanical speedometer 28VB valve D1 Pilot valve

¾” COC, Hand brake, Control air pressure,     LOP, FOP, BAP gauges, OPS D1 emergency flap valve

3. Control Compartment. 

On front panel 

Dome light circuit Breaker (DLCB)

Head Light circuit Breaker (HLB)

Cab light circuit Breaker Battery ammeter Battery Breaker (MB1)

Control Breaker (MB2

Auxiliary Generator Field Breaker(AGFB)

Fuel pump Breaker(FPB)

Crankcase Exhauster Breaker (CCEB)

Start Button ,Stop Button Engine control switch ( ECS)

Motor cut out switch (MCO)

Compartment light switch

Ground Relay reset knob

Inside front panel – Signal Relay (SR), Engine speed Relay (1,2,3,4,), Field shunt ,Relay (FSR), Transition Relay (TR), Safety Auxiliary Relay(SAR), Dead Means Relay(DMR), Breaking Relay (BKR), Ground Relay(GR), Generator Field contactor(GFC), Reverse control panel (RCD), Fuel pump contactor(FPC), Voltage Regulating panel(VRP), Transition panel (TRP), Engine Control panel(ECP), Excitation panel, Wheel slip Relay(WSR-1,2,3), Transition Excitation transformer (TET)

Power Contactors(P31,S31,P22,P21,S21,P32,P2,S1,P1), Cranking contactor (CK1,CK2), Braking and Traction contactor (BKT-1, 2) Reverser contactor (REV-1, 2), Load Ammeter shunt (LAS) Armature Current control Reactor (ACCR).

Back Panel- Radiator fan Contactor (R1&R2), Temperature Control Resistance (TCR), Voltage Dividing Panel (VDP), Gauge Lamp Resistance, Generator Field Resistance (GFR), Wheel slips Relay Resistance (WSRR), Field control Panel(FCP), Field shunt Relay Resistance (FSRR), Head light Resistance (HLPR), Voltage Regulating Current limit shunt (VRCLS), Arc suppression Rectifier(CPR-1,2)

4. Generator Room 
Main Generator, Auxiliary Generator, Exciter Generator, FTTM, Generator Gear Case and its dip stick gauge

5. Engine Room
251-B 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
Right side fuel oil gallery

 On engine left hand side 

Crank case Exhauster Motor 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. Expressor Room 

Expressor                                         Fuel pump motor

Water drain cock                             Air maize oil bath filter

Car body filters                               ETS-1, 2, 3.

Water temperature gauge                LWS& its Test cock

Lube oil relief valve                       Lube oil regulating valve

NS-16 governor & its cock, Norton filter

 7. Radiator Room

Lube oil by pass valve                      Lube oil cooler

Radiator core                                     Radiator fan

Sand boxes                                        Expansion tank no. 1&2

Right Angle Gear Box                       Eddy current clutch coil (ECC)

Lube oil filter drum and its drain cocks

Rear Truck Traction Motor Blower (RTTM)

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 tri mount                                   bogie Front truck

Rear Truck                                             Center Pivot

Side load Bearer                                     Helical Spring

Equalizing beam                                     Axle Box

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

M.R Tank                                             Axle Generator

Mechanical speedometer sensor           Brake system

valves Hand brake chain

Co-Co tri mount bogie is fitted in under truck of WDM2 loco. The short hood side bogie is called front truck and the long hood side bogie is called Rear Truck.

Bogie frame is made of cast steel, on each bogie one center pivot and two side load bearer are provided .The whole load of super structure is divided on these center pivots and side load bearer, each center pivot carries 30% load and side load bearer carries 10% each. On each axle journal, one axle box is fitted. The load is transferred on axle box through helical spring on equalizing beam. There is one set of two equalizing beams, these two beams are tied together by a tie bolt and on each set of the equalizing beam one spring chair is provided on which two sets helical springs are mounted. One set of helical spring having snubber, because of spring and snubber vibration and jerks on the frame are minimized. In this way both bogies having 16 equalizing beams, 16 spring sets and snubber (08 no.).

Traction motor is mounted on each axle with the help of suspension bearing and other end of TM is placed on cross member embarked nose pads. For lubrication of suspension bearing wick pads are provided. Lower end of wick pad is dipped in oil and upper end supplies oil to bearing and axle. On each axle two numbers of suspension bearings are provided, thus total number of suspension bearings is 12.

A 65 teeth drive gear is provided on each axle and a 18 teeth pinion gear fitted on armature of Traction motor is matched with axle gear. This gear assembly is placed in traction motor gear case; it is made up in two parts and fitted together with C-clamp & flange bolts. This gear case is fitted on TM yoke with three foundation bolts; gear assembly is lubricated by servo coat. On each bogie 4 brake cylinder and brake assembly is mounted. Each cylinder operates 3 brake blocks as such 24 nos. of brake blocks are provided.

Comparative study of different systems of WDM2 in comparison with WDG-3A loco

 Fuel Oil System 

1. Fuel tank capacity is 5000 lit. 
2. Marking on glow rod gauge is 540 -5000 liter.
3. Glow rod gauge is fitted.
4. The tank is welded with superstructure. 
5. Regulating valve setting is 3.6 kg/cm2 .

 Lube Oil System

1. Sump capacity is 990 lit. 
2. Setting of relief valve is 7.5 kg/cm2 and regulating valve is 4.2 kg/cm2. 
3. Marking on dip-stick gauge 0- 400 liter. 

Cooling Water System 

1. After cooler is connected in delivery side of water pump. 
2. Radiator core is small in size.
3. ETS 1,2,3 (Engine Temp. switch) is provided.

Air intake System 

1. ALCO-720 TSC is provided. 
2. Maximum BAP is build up to 1.7 kg/cm2 . 
3. After cooler is small in size. 
4. Air maze oil bath filter is provided in place of Cyclonic filter. 
5. Run down test is carried out of TSC.
6. Run down test timing is 90 -180 sec. 

Compressed Air System 

1. Expressor is provided in place of compressor. 
2. There are six cylinders, out of which three exhauster and other three is compressor cylinder.
3. One inters coolers provided. 
4. NS16 governor is provided. 
5. Vacuum check valve is fitted for the safety of expressor unit. 
6. Expressor sump capacity is 30 liters. 
7. MR1& 2 are provided both side of fuel oil tank. 

Brake System

1. 28LAV-1 brake system is fitted; both vacuum and air brake train can be worked. 
2. In this system SA-9 has three positions. 
3. Quack release position is used to loco brake in conjunction working. 
4. 28VBvalve is provided in place of C3W. 
5. COC with strainer is provided for isolating conjunction braking.

Engine Starting Procedure

1. Check and secure the Loco. 
2. Put ‘ON’ Dome light breaker and switch. 
3. Close the battery knife switch. 
4. Put ‘ON’ MB-1 breaker. 
5. Put ‘ON’ MB-2 breaker 
6. Put ‘ON’ MFPB-1 breaker. 
7. Put ‘ON’ MFPB-2 breaker. 
8. Put ‘ON’ CEB breaker. 
9. Put ‘ON’ FPB breaker 
10. Kept ECS from Idle to run position three times and kept in Idle at last. Alarm will ring in run position, on hearing it the staff working on locomotive will alert and come to know that engine is starting.
11. Press the Start Button 
12. CK1 and CK2 will pick up and engine will crank. 
13. When lube oil pressure builds up to 1.6 kg/cm2 then ESLP will extinguish. 
14. Release start button and ensure dropping of CK1 & CK2. 
15. Put ON AGFB on front panel. 

Note –

1. In WW governor Loco it is necessary to put On MCB1,2 to ring alarm before pressing Alarm push button located on front panel, otherwise alarm bell will not ring.

2. During Engine starting all indications is similar as WDG-3A Loco except AGFL will glow on closing of MB-1.

Engine Stopping Procedure – Same as WDG-3A Loco.

Engine Speed Control 

The engine speed is control same as WDG-3A Loco, interlocks of GFOLR and VAPR is not provided in speed control circuit. 8th notch speed is 1000 rpm.

 GFC Control 

Circuit It is same as in WDG-3A Loco, NCI of GFOLR, VAPR is not provided and CK1, CK2 (NCI) is replacement of CK3 (NCI).

Transition

1. Three transitions are takes place in WDM-2 loco at the speed of 30, 50, 80 km/h respectively. (SP to SP+FS, SP+FS to P and P to P+FS )

2. FSR, FSRR, FS contactors are provided on this Loco.

3. Four cards (210/1, 210/2,210/3,207) are provided on TRP. Indication Lamps Following, indication lamps are provided on both control stands in WDM2 Loco.

Safety Devices

1. OPS
2. LWS 
3. OSTA 
4. SAR 
5. DMR 
6. GR 
7. WSR 
8. ETS3 
9. Circuit breakers

 Safety Fittings 

1. Head light (with proper focus) 
2. Flasher light
3. Marker light (with red glass) 
4. Rail Guard 
5. Cattle Guard 
6. Foundation bolts of Buffer. 
7. CBC locking pin 
8. Horns 
9. Wiper
10. Sanders (with pipe fitment) 
11. Speedometer (with speed recorder) 
12. Equalizing beam tie bolts and its split cutter. 
13. Equalizing beam safety bracket.
14. Brake blocks hanger pins and its retaining bolts. 
15. ‘J’ bracket of brake pull rod. 
16. Safety chain of brake cross tie bar 
17. Axle box stay plate and its bolts. 
18. Traction motor gear case foundation bolts 
19. Traction motor Gear case ‘C’ clamp and its flange bolts. 
20. Suspension bearing housing bolts. 
21. Traction motor nose suspension guide bolts. 
22. Bogie safety pin. 
23. Hand brake.