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What do the designations such as ‘WDM-2’ mean?

20-06-2019

Locos, except for older steam ones, have classification codes that identify them. This code is of the form '' In this the first item, '', is a single letter identifying the gauge the loco runs on: W = Broad Gauge Y = Meter Gauge Z = Narrow Gauge (2' 6") N = Narrow Gauge (2') The second item, '', is one or two letters identifying the power source: D = Diesel C = DC traction A = AC traction CA = Dual-power AC/DC traction B = Battery electric(rare) The third item, '', is a single letter identifying the kind of load the loco is normally used for: M = Mixed Traffic P = Passenger G = Goods S = Shunting L = Light Duty (Light Passenger?) (no longer in use) U = Multiple Unit (EMU /

What is Permissive Block (or Absolute Permissive Block) Signalling?

July 16, 2019

Normally, in Absolute Block Signalling, the single-line section between points where sidings or loops are provided must be treated as a single block in order to prevent two trains from entering it at the same time. However, this also reduces track utilization in the case of trains following one another in the same direction. In these cases, a

What is Automatic Block Signalling? (What is the Automatic Block system?)

July 16, 2019

In Automatic Block Signalling (ABS) the signals are automated and operate in conjunction with track circuiting or other means of detecting the presence of a train in a block section. As of March 2003, IR had 3,606 kms of track under the ABS system. When a train enters a block section, the stop signal protecting that block changes automatically

Know About -What’s a Moving Block system? – Indian Railway

July 16, 2019

Moving block is a more advanced system usually associated with ATC (Automatic Train Control). It is not in use anywhere on IR. In moving block systems, a train's position and speed are communicated to control equipment which then computes the appropriate headway to be maintained between and other trains on the same track, and accordingly

What is Controlled Manual Block?

July 16, 2019

Controlled Manual Block is a system where a manually operated block instrument is used for obtaining the Line Clear permission from the station in advance; however, the clearance of the section must first be verified through track circuiting. The block instrument is connected to the track circuits, and it is not possible for Line Clear to be

What is Open Block?

July 16, 2019

The basic token-based Absolute Block system described above has three states: Line Clear, Train on Line, and Line Closed. (Of course, on single-line systems there may be Train Coming From and Train Going To instead of Train on Line). This is also known as Three-Position Block, or Closed Block, because the fundamental assumption is that the block

What is Lock and Block?

July 16, 2019

Lock and Block is a refinement of the Absolute Block system which is often used in areas with power signalling. (Although there is no direct connection with power signalling, the availability of electricity makes it possible.) It is especially relevant on double lines where entry of the train to the block section is controlled by taking off the

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What do the designations such as ‘WDM-2’ mean?

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