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Section 14: Temporary Speed Restriction Signs

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When a T.S.R. is imposed in an interface area between Network Rail and CTRL infrastructure, speeds will be expressed in both miles per hour and kilometres per hour. The metric speed value is shown in yellow figures on a black background, at both the warning board [14.61] and the speed indicator [14.62]. Differential speeds are not permitted on these signs.

[14.61] Warning Board also showing metric speed.
Area: NR/CTRL Interfaces   Usage: Unknown   Status: Current
[14.62] Speed Indicator also showing metric speed.
Area: NR/CTRL Interfaces   Usage: Unknown   Status: Current

From 2005, temporary and emergency speed restrictions in the Ashford International area have been indicated by signs showing speeds in both miles per hour and kilometres per hour. The warning boards and speed indicators are of the same design as those that apply to Tyne & Wear Metro units between Pelaw and Sunderland (see [14.56 & 14.57]). At Ashford, however, the "km/h" speed value is always a direct conversion of the miles per hour value (rounded down to the nearest 5 km/h). Where differential speeds apply, two pairs of speed figures are displayed at the warning board [14.63] and the speed indicator [14.64].

[14.63] Warning Board for a Differential T.S.R. also showing metric speeds.
Area: Ashford International   Usage: Unknown   Status: Current
[14.64] Speed Indicator for a Differential T.S.R. also showing metric speeds.
Area: Ashford International   Usage: Unknown   Status: Current

During high wind conditions, it may be necessary to restrict the speed of electric trains, to prevent damage to the overhead line equipment. In 2006, motorway-style illuminated signs were put on trial at two sites between Morpeth and Berwick on the East Coast Main Line, one near Ulgham Grange level crossing and the other at Belford. Normally these signs were extinguished, but would be switched on when high winds had been forecast or in the event of high winds occurring that had not been forecast. When the sign was displaying a letter "T" [14.65], no wind-related speed restriction was in force and normal speed applied. When "80" was displayed [14.66], a speed restriction of 80 m.p.h. applied to electric trains. Double-headed electric hauled freight trains were, however, restricted to 60 m.p.h. The signs were taken out of use in 2013, the trial having come to an end.

[14.65] Wind Sign displaying "T".
Area: Ulgham Grange / Belford   Usage: Low   Status: Historical
[14.66] Wind Sign displaying "80".
Area: Ulgham Grange / Belford   Usage: Low   Status: Historical

During periods of hot weather, it may be necessary to impose emergency speed restrictions as a precaution against the risk of rails expanding to such an extent that they could buckle. The usual signage associated with an emergency speed restriction will be provided. In 2006, a trial was undertaken on the southern part of the West Coast Main Line to test the effectiveness of signs that will indicate to drivers when a heat speed restriction has not been imposed or has been suspended. During such times, a letter "H" is displayed in place of the restriction speed at both the warning board [14.67] and the speed indicator [14.68]. When "H" boards are displayed, drivers may ignore the signs and drive at normal speed. Although similar in application to a 'spate' indication (see [14.22 & 14.23]), the difference with the "H" boards is that they can be removed and the speed restriction at that location imposed in their place without warning.

[14.67] Experimental Warning Board for a Heat Speed Restriction that is not in force.
Area: West Coast South   Usage: Unknown   Status: Uncertain
[14.68] Experimental Speed Indicator for a Heat Speed Restriction that is not in force.
Area: West Coast South   Usage: Unknown   Status: Uncertain

In 2009, it became practice to exhibit a speed indication at a repeating warning board [14.69]. Where appropriate, a directional indication may also be provided [14.70]. If the T.S.R. is withdrawn early or not imposed, the speed indication may be replaced by a spate indication [14.71].

[14.69] Repeating Warning Board.
Area: All Areas   Usage: High   Status: Historical
[14.70] Repeating Warning Board with Directional Indication (e.g. applicable to right-hand divergence).
Area: All Areas   Usage: High   Status: Historical
[14.71] Repeating Warning Board with Spate Indication.
Area: All Areas   Usage: High   Status: Historical

From December 2013, the presentation was altered to place the repeating warning board above the speed indication [14.72 & 14.73] or spate indication [14.74]. The purpose of this change is to make the "R" appear visible to drivers first, when the board is positioned at the end of a station platform.

[14.72] Repeating Warning Board.
Area: All Areas   Usage: High   Status: Current
[14.73] Repeating Warning Board with Directional Indication (e.g. applicable to left-hand divergence).
Area: All Areas   Usage: High   Status: Current
[14.74] Repeating Warning Board with Spate Indication.
Area: All Areas   Usage: High   Status: Current