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

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

July 16, 2019, 12:52 PM

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 down direction. [10/02] E.g., Palghat – Podanur section which is one of these increasingly rare single-line sections with bidirectional traffic.

In a double line section, each line is dedicated for a given direction, so that the up and down tracks are separate. However, to improve traffic throughput, sometimes the twin single line system is adopted, where either of the two lines in a doubled section can be used for bidirectional traffic. Again, as with a single-line bidirectional system, signals are provided for both directions on both tracks. Just before or after a station, track branches to switch from one line to the other are provided, so that traffic on either line is not held up if one of the lines is occupied at the station. The Coimbatore – Palghat (perhaps just the Podanur – Palghat part?) section is an example of twin single-line, as are Morappur – Salem, Dansihpet – Lokur, Yeshwantpur – Bangalore City, etc. These sections tend to have a poorer safety record.

A few sections with heavy traffic have multiple line systems. In a triple line system as is found in some ghat sections where it is necessary to have multiple lines to segregate slower and faster traffic but there is no room to build four tracks, three tracks are used, and the middle track then acts as a bidirectional single line. In a quadruple line there is a pair of up tracks and a pair of down tracks. Sometimes these may allow for segregation of fast vs. slow traffic or suburban vs. long-distance traffic, but not always.

Source – IFRCA.org

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