Indian locomotive class WAM-4

Specifications
Specifications
Configuration:;
• AAR	C-C
• UIC	Co′Co′
• Commonwealth	Co+Co
Gauge	5 ft 6 in (1,676 mm)
Bogies	ALCO Asymmetric cast frame trimount
Wheel diameter	New: 1,092 mm (3 ft 7 in); Half worn: 1,055 mm (3 ft 5+1⁄2 in); Full worn: 1,016 mm (3 ft 4 in)
Wheelbase	2,108 mm (6 ft 11 in)
Length:;
• Over couplers	19,975 mm (65 ft 6 in)
• Over body	18,680 mm (61 ft 3 in)
Width	3,055 mm (10 ft 0 in)
Height	4,162 mm (13 ft 8 in)
Frame type	Asymmetric cast frame
Axle load	18.8 tonnes (18.5 long tons; 20.7 short tons)
Loco weight	112.8 tonnes (111.0 long tons; 124.3 short tons)
Sandbox cap.	16 units X 30 t (30 long tons; 33 short tons)
Power supply	110 V DC Supply
Electric system/s	25 kV 50 Hz AC Overhead
Current pickup(s)	Pantograph
Traction motors	Alstom TAO 659A1
• Rating 1 hour	770 HP. 750 V, 840 A, 1095 RPM
• Continuous	798 HP. 750 V, 870 A, 1070 RPM
Head end power	110 V DC Supply
Transmission	Electrical
Gear ratio	15:62
MU working	4 units
Loco brake	Air, Rheostatic braking
Train brakes	Air, Vacuum and Dual
Safety systems	Slip control, Over voltage relay, No volt relay, Earth fault relay, Low pressure governor, Train parting alarms, and Brake cylinder cutoff valve

Type and origin
Type and origin
Power type	Electric
Designer	RDSO
Builder	CLW
Build date	1970–1983
Total produced	WAM-4: 500; WAG-5: 53;
Rebuilder	CLW
Rebuild date	1978–1983 to WAG-5
Number rebuilt	53

WAM-4
WAM-4
	Arakkonam based WAM-4 at Perambur
Power type
Type and origin
Power type	Electric
Designer	RDSO
Builder	CLW
Build date	1970–1983
Total produced	WAM-4: 500; WAG-5: 53;
Rebuilder	CLW
Rebuild date	1978–1983 to WAG-5
Number rebuilt	53
Configuration:;
Specifications
Configuration:;
• AAR	C-C
• UIC	Co′Co′
• Commonwealth	Co+Co
Gauge	5 ft 6 in (1,676 mm)
Bogies	ALCO Asymmetric cast frame trimount
Wheel diameter	New: 1,092 mm (3 ft 7 in); Half worn: 1,055 mm (3 ft 5+1⁄2 in); Full worn: 1,016 mm (3 ft 4 in)
Wheelbase	2,108 mm (6 ft 11 in)
Length:;
• Over couplers	19,975 mm (65 ft 6 in)
• Over body	18,680 mm (61 ft 3 in)
Width	3,055 mm (10 ft 0 in)
Height	4,162 mm (13 ft 8 in)
Frame type	Asymmetric cast frame
Axle load	18.8 tonnes (18.5 long tons; 20.7 short tons)
Loco weight	112.8 tonnes (111.0 long tons; 124.3 short tons)
Sandbox cap.	16 units X 30 t (30 long tons; 33 short tons)
Power supply	110 V DC Supply
Electric system/s	25 kV 50 Hz AC Overhead
Current pickup(s)	Pantograph
Traction motors	Alstom TAO 659A1
• Rating 1 hour	770 HP. 750 V, 840 A, 1095 RPM
• Continuous	798 HP. 750 V, 870 A, 1070 RPM
Head end power	110 V DC Supply
Transmission	Electrical
Gear ratio	15:62
MU working	4 units
Loco brake	Air, Rheostatic braking
Train brakes	Air, Vacuum and Dual
Safety systems	Slip control, Over voltage relay, No volt relay, Earth fault relay, Low pressure governor, Train parting alarms, and Brake cylinder cutoff valve
Maximum speed
Performance figures
Maximum speed	120 km/h (75 mph)
Power output	3,640 hp (2,710 kW)
Tractive effort:;
• Starting	33,840 kgf (331.9 kN; 74,600 lbf)
• 1 hour	30,000 kgf (290 kN; 66,000 lbf)
• Continuous	17,600 kgf (173 kN; 39,000 lbf)
Operators
Career
Operators	Indian Railways
Class	WAM-4
Numbers	WAM-4B: 20400–20699, 21200–21399; WAG-5: 21100-21138;
Nicknames	Garuda, Ananth, RAJATABHA, Surubhi, Navchetna, Sukh Sagar, Naveen
Locale	All over India
Delivered	4 December 1970
First run	March 1971
Withdrawn	May 2023
Preserved	6 units
Disposition	A few units still in inferior service, rest scrapped

The Indian locomotive class WAM-4 is a class of 25 kV AC electric locomotives that was developed in 1970 by Chittaranjan Locomotive Works for Indian Railways. The model name stands for broad gauge (W), alternating current (A), mixed traffic (M) locomotive, 4th generation (4). They entered service in March 1971. A total of 500 WAM-4 were built at CLW between 1970 and 1983, which made them the most numerous class of mainline electric locomotive till its successor the WAG-5.

The WAM-4 is one of the most successful locomotives of Indian Railways having served both passenger and freight trains for over 52 years. This class provided the basic design for a number of other locomotives like WCAM-1, WAG-5A, WCG-2, and some WAP-1 models. However, with the advent of new 3-phase locomotives like WAP-5 and WAP-7, the WAM-4 locomotives were relegated to hauling smaller passenger trains and most of the units have been scrapped. A few units are in service performing backup and non essential duties.

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