YAM–1
These cute little B-B MG electrics, 20 in number (18 ordered first, two later) were supplied by Mitsubishi in 1964 and worked on SR, especially in the Madras area, until the recent conversion to BG of the mainline tracks. These were later [12/03] run on the Tambaram - Villupuram section of the mainline. On June 30, 2004, the last YAM-1 run took place, minutes after the last MG EMU service on the Chennai network reached the Tambaram station. The remaining YAM-1 locos are now at Tambaram, only occasionally energized for departmental work. One unit is [2/05] at CLW, apparently undergoing preservation work prior to being plinthed.
They...
more... have monomotor bogies, with two bogie-mounted DC motors permanently coupled in parallel. They are not very powerful, although they have been used to haul some longish (50-wagon) goods trains on occasion. Air brakes for loco, vacuum train brakes. Oerlikon compressor and exhauster, Arno rotary convertors.
Now [11/01] one is said to be at the Chittaranjan Loco Works. There are rumours that some or all of them may be refurbished and exported to some other country.
Manufacturers: Hitachi
Traction Motors: ACEC/Alstom/Siemens MG1420 (two). Fully suspended, force-ventilated. 5600kg. 1080kW, 1250V, 920A, 630 rpm
Gear Ratio: 3.95 : 1
Transformer: Mitsubishi 'Shell Sub', 1690kVA, 25 taps.
Rectifiers: Secheron excitron rectifiers, type A268 (four). 510A/1250V
Pantographs: Two Faiveley AM-12.
info courtesy:- IRFCA FAQ