What are speed restrictions and engineering restrictions?

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What are speed restrictions and engineering restrictions?

July 17, 2019, 1:43 PM

These are various kinds of speed limits below the normal sanctioned speed limit for the route section in question, imposed in stretches of track where unsafe conditions exist because of track damage, ongoing repair work to track or OHE, accidents, or unusual circumstances in the construction of the permanent way (see above).

A temporary engineering restriction is specifically one that is imposed for a fixed duration on account of ongoing work on the permanent way or OHE equipment; a permanent engineering restriction is one that is in effect indefinitely because of characteristics of the permanent way. Other temporary speed restrictions may be imposed because of flooding, track damage, accidents, etc. A stop dead restriction is one which requires a train to come to a complete halt before obtaining permission to proceed.

For short-duration (1 day or less) temporary speed restrictions, hand signals are used at appropriate points (30m to the rear, and 800m (more in some cases) to the rear) to advise drivers of the location of the restriction. For a short-duration stop-dead restrictions, a red banner flag is placed across the tracks just before the obstruction, and another banner flag is placed beside the tracks 600m (BG; 400m for MG/NG) before the location of the affected portion of track. Three detonators are also placed 10m apart, about 1200m (BG; 800m for MG/NG) before the banner. Hand signals are used 30m to the rear of the obstruction and 45m to the rear of the detonators.

For longer temporary speed restrictions (lasting more than a day) a speed indicator is placed 30m to the rear of the affected portion, and a caution indicator 800m (or more in some cases) to the rear. For longer stop-dead restrictions, the speed indicator is replaced by a stop indicator, whereas the caution indicator is placed 1200m to the rear (BG; 800m for MG/NG).

Normally the driver and guard of a train are issued caution orders that provide details of the temporary restrictions. Caution orders are not issued for permanent restrictions of any kind.

The caution or stop indicators, banner flags, hand signals, and speed indicators are all dispensed with if the affected portion of track is within station limits and if it can be appropriately isolated by the settings of points and leaving signals protecting it ‘on’ (at danger). The caution indicator is also dispensed with if the affected portion of track is protected by an automatic signal less than 1200m (BG; 800m MG/NG) from the obstruction. In this case the detonators and banner flags are placed at 180m and 90m to the rear of the obstruction for a stop-dead restriction.

Source – IFRCA.org

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