Home Page > Section 14; pages: 1, 2, 3, 4

Section 14: Temporary Speed Restriction Signs

(Page 2 of 4)


When battery-lit signs were adopted for general use at T.S.R.s in 1981, the colours of the speed indicators were reversed such that they had white figures on a blue background [14.24 & 14.25], thus making them the same as the speed indication displayed at the warning board (see [14.19]). In the case of a warning board referring to a differential speed restriction, both speeds were exhibited above the yellow plate and flashing lights [14.26].

[14.24] Speed Indicator.
Area: All Areas   Usage: High   Status: Historical
[14.25] Differential Speed Indicators.
Area: All Areas   Usage: High   Status: Historical
[14.26] Battery-lit Warning Board for a Differential T.S.R.
Area: All Areas   Usage: High   Status: Historical
[14.27] Battery-lit Warning Board with Spate Indication.
Area: All Areas   Usage: High   Status: Historical

The directional indication [14.28] was on trial from 1982 and fully introduced in 1986. This is fitted to a warning board to indicate that the T.S.R. speed indicator is situated on a left-hand or right-hand divergence ahead.

[14.28] Warning Board with Directional Indication (e.g. applicable to T.S.R. on right-hand divergence).
Area: All Areas   Usage: High   Status: Historical

In 1982, trials commenced which entailed a black and white striped board with a central flashing white light [14.29] being positioned on the approach to various T.S.R. warning boards (between the warning board and its associated AWS magnet). The purpose of the trials was to assess the board's effectiveness in connection with emergency speed restrictions. An emergency speed restriction is one that has not been advised in the notices, is a lower speed or applies at a time not shown. The new board was intended to provide drivers with additional warning of an emergency speed restriction ahead, replacing the former practice of stationing handsignalmen at warning boards associated with such speed restrictions. The handsignalman would place two detonators on the rail and exhibit a yellow handsignal waved slowly from side to side for each approaching train. As well as being costly to implement, the noise from the exploding detonators was often a source of public complaints.

[14.29] Experimental Emergency Indicator.
Area: Various   Usage: Low   Status: Historical

From 1986, yellow versions of the illuminated T.S.R. signs were on trial [14.30 - 14.37] and gradually they superseded the blue signs formerly used.

[14.30] Warning Board.
Area: All Areas   Usage: High   Status: Historical
[14.31] Warning Board for a Differential T.S.R.
Area: All Areas   Usage: High   Status: Historical
[14.32] Warning Board with Directional Indication (e.g. applicable to T.S.R. on left-hand divergence).
Area: All Areas   Usage: High   Status: Historical
[14.33] Speed Indicator. Click Here for Photo
Area: All Areas   Usage: High   Status: Current
[14.34] Differential Speed Indicators.
Area: All Areas   Usage: High   Status: Current
[14.35] Termination Indicator. Click Here for Photo
Area: All Areas   Usage: High   Status: Current
[14.36] Warning Board with Spate Indication.
Area: All Areas   Usage: High   Status: Historical
[14.37] Spate Indication in lieu of speed indicator.
Area: All Areas   Usage: High   Status: Current

Following the initial trials in 1982 of an indicator for use with emergency speed restrictions (see [14.29]), further trials took place in 1986 on each of the five B.R. Regions. The new design of indicator, with two high-powered flashing lights [14.38], was positioned adjacent to the AWS equipment in rear of a T.S.R. warning board. While the trials were a success, a revised version of indicator [14.39] was on trial in 1987 and introduced as standard the following year. Additional AWS equipment is installed in rear of each emergency indicator. A miniature version of the indicator was also introduced, on which the lower black shape is omitted [14.40]. An emergency indicator may be colloquially referred to as a 'Dalek', 'disco board' or 'Metal Mickey'.

[14.38] Experimental Emergency Indicator.
Area: Various   Usage: Low   Status: Historical
[14.39] Emergency Indicator. Click Here for Photo
Area: All Areas   Usage: High   Status: Current
[14.40] Emergency Indicator for use in areas of limited clearance.
Area: All Areas   Usage: High   Status: Current

The 'repeating warning board' [14.41] was introduced in 1992. It serves as a reminder to drivers of a T.S.R. ahead, where a station platform intervenes between the warning board and the speed indicator. If the T.S.R. speed indicator is less than 300 yards ahead of the platform then no repeating warning board need be provided. In 1993, use of the repeating warning board was extended to include connections from sidings that fall between the warning board and the speed indicator.

[14.41] Repeating Warning Board. Click Here for Photo
Area: All Areas   Usage: High   Status: Historical

Both lines across the Forth Bridge are signalled bi-directionally to allow all traffic to be worked over one line, in both directions, while the other line is out of use and under possession for engineering work. For all pre-planned work, a temporary speed restriction of 20 m.p.h. will be imposed for right-direction movements. Wrong-direction movements are subject to a 20 m.p.h. permanent speed restriction. New special arrangements for signage associated with these pre-planned temporary speed restrictions on the bridge were introduced c.1993. No warning board or AWS equipment will be provided. The speed indicator is a blue circular board [14.42], which replaces the permanent speed restriction sign that is normally exhibited on the approach to the bridge. The termination indicator has a white "T" on a blue background (see [14.21]). Drivers may accelerate as soon as the front of the train has passed the termination indicator. If the work is unplanned or the restriction is to be more severe than 20 m.p.h., standard T.S.R. signage including warning boards and AWS will be provided.

[14.42] Speed Indicator. Click Here for Photo
Area: Forth Bridge   Usage: Low   Status: Current

In 1996, use of directional indicators, as previously used with T.S.R. warning boards (see [14.32]), was extended for use on speed indicators [14.43] where the T.S.R. applies through a divergence immediately ahead.

[14.43] Speed Indicator with Directional Indication (e.g. applicable to left-hand divergence).
Area: All Areas   Usage: High   Status: Current