IR class WAM-2/3
| IR class WAM-2/3 | |
|---|---|
| Numbering: | WAM-2: 20300-20335 WAM-3: 20336-20337 |
| Number: | WAM-2: 36 WAM-3: 2 total: 38 |
| Manufacturer: | The Japanese Group consortium consisting of: |
| Year of construction (s): | 1960-1964 |
| Retirement: | 1990-2005 |
| Axis formula : | Bo'Bo ' |
| Gauge : | 1676 mm |
| Length over coupling: | 15,000 mm |
| Length over buffers: | 14,600 mm |
| Height: | 4,165 mm |
| Width: | 3,152 mm |
| Bogie axle base: | 2,600 mm |
| Service mass: | 76 t |
| Wheel set mass : | 19 t |
| Top speed: | up to 1980: 100 km / h from 1980: 120 km / h |
| Short term output: | 2,910 hp (2,170 kW) |
| Continuous output : | 2,790 hp (2,081 kW) |
| Starting tractive effort: | 248 kN |
| Wheel diameter: | 1,120 mm |
| Power system : | 25 kV 50 Hz ~ |
| Power transmission: | 2 single arm pantographs type Faiveley AM-12 |
| Number of traction motors: | 4 × Mitsubishi MB 3045-A (hour: 745 hp (556 kW) at 725 V, 815 A and 1000 min -1 Weight:. T 2,2) |
| Drive: | Pawbearing drive |
| Transmission ratio: | 1: 3.88 |
| Type of speed switch: | High voltage step switch with 20 speed step switch |
| Locomotive brake: |
Resistance brake , direct brake (only the first ten locomotives), hand brake |
| Train brake: | Vacuum brake |
WAM-2 and WAM-3 are electric locomotives of Indian Railways for operation with 25 kV alternating current with a frequency of 50 Hz, between 1960 and 1964. Japan were imported. The designation is made up of W for wide ' Breitspur ' , A for alternating current 'Alternating current' and mixed ' Universal locomotive for goods and passenger traffic ' . In addition to the 36 WAM-2s, two WAM-3s were delivered, which were equipped with modified rectifiers . Both series were in use for more than 40 years before freight and passenger trains. All locomotives have been decommissioned, none has been preserved for posterity. Four electrical pieces of equipment from WAM-2 locomotives were used to build six-axle WAP-2 locomotives that were used in heavy passenger train traffic. They did not prove their worth and were retired in the 1980s.
history
Indian Railways introduced electrical operation with alternating current using the WAM-1 locomotives of the European 50 Hz consortium . In order to set up an alternative supplier for locomotives, locomotives were ordered from a consortium called The Japanese Group consisting of Mitsubishi , Hitachi and Toshiba , which had a slightly lower performance than the WAM-1. From 1960 onwards, delivery took place in two lots: the first lot consisted of 10 locomotives of class WAM-2, the second lot of 26 locomotives of class WAM-2 and two locomotives of class WAM-3. In contrast to the locomotives from the first delivery lot, the WAM-2 locomotives from the second lot had no air compressors and therefore no direct brakes .
The WAM-2 locomotives, like the WAM-1 locomotives, were used on the Ganges level, where the first lines electrified with 25 kV alternating current were located. They were assigned to the Asansol depot of the regional company Eastern Railway (ER), but sometimes ran from Calcutta via Kanpur to New Delhi .
In February 1980, the top speed of the WAM-2 and WAM-3 locomotives was increased from 105 km / h to 120 km / h . This was done for use in front of the high-quality Rajdhani Express , which connected Calcutta with New Delhi in the night jump.
At Indian Railways, the locomotives were usually retired after 35 years of service. The WAM-2 locomotives were already taken out of service after 30 years because equipping them with compressed air brakes was no longer worthwhile for the remaining five years. The remaining locomotives were scrapped around 2000, with some still in good condition.
technology
A transformer converts the contact wire voltage of 25 kV to 1070 V down that the Ignitron - mercury vapor rectifier was fed to the four traction motors with direct current supplied. The voltage regulation took place on the high voltage side of the transformer with a step switch that had 20 speed steps. The DC traction motors from Mitsubishi were fully suspended in the bogies . The axles were driven by a curved tooth coupling on an axle-mounted gear. Some locomotives were later converted to Excitron rectifiers. All locomotives had a resistance brake .
WAM-3
The class WAM-3 locomotives were two modified WAM-2s, which were numbered 20336 and 20337 and were also based in Asansol. Externally, they could be recognized by the single-arm pantographs pointing with their knees against the front wall - on the WAM-2, the pantographs' knees pointed towards the center of the locomotive. Instead of the mercury vapor rectifiers, the WAM-3 had those with silicon diodes , the rest of the equipment was identical to the WAM-2. The two locomotives were used before prestigious trains such as Kalka Mail or Toofan Express between Calcutta and Delhi, but were replaced by the WAM-4 , so that they were only used in front of passenger trains. Both locomotives were scrapped, with the 20337 still being used as a shunting locomotive in Asansol in January 2000.
WAP-2
The WAP-2 locomotives were created by using the electrical equipment of WAM-2 locomotives in mechanical parts from the WAP-1 class; the numbers of the donor locomotives used are not known. The four WAP-2 were also assigned to the Asansol depot. They had two three-axle bogies with a pawl bearing drive . They were used in front of heavy passenger trains for a long time, sometimes also before the Howrah Rajdhani Express . The series did not prove itself, which is why the locomotives were scrapped in 1980. There are no known photos of the WAP-2.
Individual evidence
- ↑ a b RDSO (ed.): Clearance of WAM-2 / WAM-3 calss AC electric locomotives for a maximum speed of 120 km / hj on Howrah – New Delhi Rajdhani route . Lucknow February 18, 1980 ( archive.org [PDF]).
- ↑ WAM-2. In: Indian Railways FAQ: Locomotives - Specific classes: AC Electric. IRFCA, accessed August 2, 2020 .
- ↑ Electric Locomotive Roster: The WAP Series! In: 24coaches. September 3, 2016, Retrieved August 2, 2020 (American English).
- ^ Evolution of Electrical Rolling Stock. Indian Railways, accessed August 3, 2020 .
- ↑ Mani Vijay: Rare Capture of WAM3 Loco at Asansol Shed (Jan. 2000) on YouTube , October 2, 2008, accessed July 27, 2020.
Web links
- Type sketches and technical data of the WAM2 / 3. In: Railworld. Retrieved August 3, 2020 .