2 Railway Employee

What kinds of electric multiple units does IR operate?

03-07-2019

IR has electric multiple units in operation in several suburban sections (Mumbai, Chennai, Calcutta, Bandel-Katwa, etc.). The Mumbai region with 1.5kV DC traction has several models of EMUs, classified from WCU-1 through WCU-15 (and beyond??). Most models have DC traction motors with rheostatic control (resistance banks to vary the input power supply). DC EMUs are also used on the Lonavala-Pune section. Information on the precise differences among various older EMU classes is lacking. EMUs for the 25kV AC sections have classifications WAU-1 through WAU-4 (and beyond??), as well as some MG units classified in the YAU series. Information on the precise differences among various older EMU

What sort of sub-ballast, blanket, and subgrade layers are provided in the track formation?

July 18, 2019

IR generally does not use a separate sub-ballast layer below the ballast layer. A blanket layer of coarse, granular material is usually provided directly below the ballast layer. Blanket layers are not provided for tracks on rocky beds, or on well-graded gravelly or sandy beds. Blankets of at least 45cm thickness are provided for tracks laid on

What kinds of ballast does IR use?

July 18, 2019

For all high-traffic lines, IR uses machine crushed hard stone ballast, usually from locally quarried granite stone, or crushed basalt. In the past, broken brick, slag from metal processing, cinders, and waste construction material were also used. For most sections with wooden sleepers, the ballast is of a 6.5cm nominal size (not more than 5%

What are the typical placement specifications for check rails or guard rails?

July 18, 2019

Wheel flanges on IR are typically about 28mm thick (new). The distance between the inner faces of wheels is typically 1600mm (BG). Check rails used to prevent wheels from climbing the rails at sharp curves are kept at a distance of about 44mm-48mm from the outer rail, allowing about 4mm tolerance for wear on the check rails. Check rails at level

What is the relationship between speed, turning radius, and track cant? What are the cant excess / deficiencies specifications for IR tracks?

July 18, 2019

Super-elevation, or cant, is provided to counteract the centrifugal tendency of trains on curves. On a canted curve (where the outer rail is higher than the inner one of the curve), the weight of the vehicle provides a component that counteracts the centrifugal tendency. Cant excess refers to the condition where the cant or superelevation is too

What dimensions of sleepers does IR use?

July 18, 2019

Wooden BG sleepers dimensions are usually 2.75m x 0.25m x 0.13m. MG wooden sleepers are 1.8m x 0.2m x 0.115m. NG sleepers are usually of the same thickness as MG sleepers, and are often made by cutting MG sleepers (sometimes discarded ones) to size and adding a new seat for the track. Most sleepers on the Darjeeling Himalayan Railway are wooden,

What does the notation ‘N+4’ or ‘M+3’, etc., mean in describing sleeper densities?

July 18, 2019

This notation is an old one. The 'N' or 'M' in this stands for the length of a rail in yards. The additional number specified represents the excess of the number of sleepers over the number of yards for a rail. E.g., 'N+3' for 11-yard (33') rails indicates 14 sleepers (11 + 3) for each rail. This was a convenient formulation, especially when rails

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What kinds of electric multiple units does IR operate?

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