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How are non-interlocked (NI) stations operated?

16-07-2019

Non-interlocked stations are what their name implies: there is no interlocking of any kind. The points have to be set appropriately and locked manually before pulling off a signal. The station master is personally responsible for ensuring that this is done and is supposed to have the keys to unlock the points with him or under his control. Trains are restricted to 15km/h over station limits. Non-interlocked stations are found only on sections with very light traffic. The most basic version of non-interlocked stations have truly no arrangement for controlling the points in relation to the signals and rely entirely on the signalman or station master. Sometimes some simple mechanisms are used

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

What is a ‘block hut’ or ‘block post’?

July 16, 2019

A block hut or block post is a minor station (usually Class C; see section on stations) on a section with light traffic, which does not have the full complement of home and starter signals to control the reception and departure of trains. It often has just a single stop signal, and a permissive signal (a distant) to its rear. Line Clear is not

What do the terms ‘block station’, and ‘halt station’ mean?

July 16, 2019

A block station is a station (along with its signalbox) associated with one end of a block section. Each block section has a block station at either end; the block stations control access to the block in either direction. A halt station is a station that is not associated with the end of a block section and has no associated signalboxes and no

What is an Intermediate Block Section?

July 16, 2019

Intermediate Block Sections are provided to increase track usage in areas with absolute block operations where the distances between successive stations are large, causing each block to be very long. The heart of the absolute block system is the idea of only permitting one train ever to be on a block at any time; however, if the block is very

Q. WHAT ARE SINGLE LINE BLOCK, TWIN SINGLE LINE BLOCK, ETC.?

July 16, 2019

A single line block system has just one track, which may be used for traffic in both directions. Signals are provided for both directions, and the token exchange or other system of interlocking works for traffic going either way. The basic principle is to restrict access to a block of track to a single train at a time, whether going in the up or

What is the bell code used to communicate between signal cabins for block working?

July 16, 2019

IR's bell code has some points of correspondence with systems used in the UK in the early part of the 20th century. The system of bell codes to convey messages from one signalbox to another is given below. An 'X' indicates a short strike on the bell, and a dash indicates a pause. Bell Codes Message Code Attention X Line Clear

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How are non-interlocked (NI) stations operated?

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