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What happens when the Alarm Chain (Emergency Chain) is pulled in a coach? (ACP, Alarm Chain Pulling)

17-07-2019

The alarm chain in a passenger coach is designed to create a break in the continuity of the brake pipes (whether vacuum or air brakes), immediately resulting in a loss of brake pressure (or vacuum) and thereby cause the train brakes to be applied. With vacuum brakes, a clappet valve is provided that is released by the pulling of the alarm chain, and with air brakes, there is a similar passenger emergency valve that can vent the brake pipe to the atmosphere. See the page on IR brake systems. At the locomotive, in addition to a warning lamp or buzzer being sounded, in most locos the master controller undergoes auto-regression, with the notches falling to zero rapidly as the locomotive's

What are the ‘Primary’, ‘Secondary’, and ‘Safe to Run’ designations for rolling stock?

July 17, 2019

Rolling stock (coaches and wagons) are usually classified into three categories for maintenance purposes. The primary maintenance category consists of vehicles that need thorough inspection and maintenance. They are to be examined closely from all aspects, and all parts that are at the limit of the prescribed running life (in km or calendar time)

How many rakes does a train require?

July 17, 2019

If there are no complications because of 3-way rake-sharing and so on, it is easy to figure out the number of rakes that are needed for any particular train service. Assuming 1-2 hours a day to allow for late running, and perhaps 4-6 hours a day for cleaning and maintenance, a rake is used perhaps 16 hours a day for short distance trips, and 18

What is the order of precedence of trains?

July 17, 2019

The order of precedence for trains governs which train gets priority when two trains have to cross on a single line, or are waiting to use a platform at a station, etc. The train with the higher precedence is given priority, and the other train is made to wait (normally, regardless of how much detention this results in, and even if the other train

How are trains scheduled?

July 17, 2019

The overall schedules and numbers of trains, as reflected in the published passenger timetables and working timetables, are decided in advance based on consideration of the operational aspects such as loco availability, loco changeovers, crew changes, section capacity, etc. In implementing these schedules, Deputy Chief Controllers or Dispatchers

How is scheduling and control of trains organized in IR?

July 17, 2019

The Control Organization of IR has primary responsibility for scheduling and running all trains, and maintaining information on the positions and movements of all rolling stock. (These functions are collectively known as control - an area of the railway network is said to be 'controlled' when a control office is in charge of it.) Each division or

Which side does traffic run on the tracks in India?

July 17, 2019

Like road traffic, railway traffic is also on the left as a rule. The rule generally applies to all double-line sections, and a train moves on the right side tracks only in exceptional situations. Of course, it does not make any difference for single-line operations, and bidirectional movement is allowed on both tracks in the case of twin

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What happens when the Alarm Chain (Emergency Chain) is pulled in a coach? (ACP, Alarm Chain Pulling)

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