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Section 13: Permanent Speed Restriction Signs

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In 1985, the Scottish Region chose the circular permanent speed restriction sign with a red border (see [13.43]) as its new regional standard and made a start on installing these on a number of routes in place of the previous 'cut-out' signs. Where a restriction applied to a diverging route, an arrow was fitted below the speed sign [13.45 & 13.46] in a manner similar to the earlier 'cut-out' signs. A standard differential speed restriction was indicated by two signs placed one above the other on the same post [13.47].

[13.45] Permanent Speed Restriction Sign with Directional Arrow (e.g. applicable to left-hand divergence). Click Here for Photo
Area: Scottish Region   Usage: High   Status: Obsolescent
[13.46] Permanent Speed Restriction Sign with Directional Arrows applicable to divergences in both directions.
Area: Scottish Region   Usage: Medium   Status: Obsolescent
[13.47] Standard Differential Permanent Speed Restriction Sign.
Area: Scottish Region   Usage: Medium   Status: Obsolescent

In January 1986, an experimental reflectorised type of 'preliminary speed board' was put on trial at two sites on the Edinburgh - Glasgow line. The board was shaped like an inverted triangle and had a yellow background [13.48]. This was intended as a replacement for the earlier floodlit warning indicators (see [13.24]).

[13.48] Experimental Preliminary Speed Board.
Area: Edinburgh - Glasgow   Usage: Low   Status: Historical

In March 1986, the permanent speed restriction signs between Tonbridge and Bopeep Junction (near Hastings) were replaced with reflectorised signs. The new signs had black figures on a circular white background, surrounded by a black border [13.49].

[13.49] Permanent Speed Restriction Sign.
Area: Tonbridge - Bopeep Junction   Usage: Medium   Status: Historical

The new design of reflectorised advance warning indicator (A.W.I.) introduced as standard later in 1986 was similar in shape to the trial version (see [13.48]) but had a white background and a yellow border [13.50]. The shape of the sign is modified to a five-sided variant where there is limited clearance or where extra width or height is needed to accommodate the speed figure [13.51].

[13.50] Advance Warning Indicator. Click Here for Photo
Area: All Areas   Usage: High   Status: Current
[13.51] Advance Warning Indicator (alternative shape).
Area: All Areas   Usage: High   Status: Current

An advance warning indicator for a standard differential speed restriction is usually a five-sided shape [13.52], although a triangular variant was used on the Western Region [13.53]. An advance warning indicator for a non-standard differential speed restriction is also a five-sided shape [13.54].

[13.52] Advance Warning Indicator applicable to a standard differential permanent speed restriction.
Area: All Areas   Usage: High   Status: Current
[13.53] Advance Warning Indicator applicable to a standard differential permanent speed restriction.
Area: Western Region   Usage: Medium   Status: Obsolescent
[13.54] Advance Warning Indicator applicable to a non-standard differential permanent speed restriction. Click Here for Photo
Area: All Areas   Usage: High   Status: Current

An advance warning indicator applicable to a speed restriction on a diverging route is fitted with a directional arrow pointing in the appropriate direction. The arrow sign is usually placed above the warning indicator [13.55], except on the Scottish Region, where it would originally be placed below [13.56], consistent with the placing of the directional arrow below the Scottish Region's circular P.S.R. signs (see [13.45]). Two arrows are displayed if the advance warning indicator applies to restrictions of equal speed on diverging routes to the left and the right [13.57 & 13.58].

[13.55] Advance Warning Indicator with Directional Arrow (e.g. applicable to left-hand diverging route).
Area: All Areas   Usage: High   Status: Current
[13.56] Advance Warning Indicator with Directional Arrow (e.g. applicable to right-hand diverging route).
Area: Predominately Scottish Region   Usage: Medium   Status: Obsolescent
[13.57] Advance Warning Indicator with Directional Arrows applicable to diverging routes in both directions.
Area: All Areas   Usage: Medium   Status: Current
[13.58] Advance Warning Indicator with Directional Arrows applicable to diverging routes in both directions.
Area: Predominately Scottish Region   Usage: Medium   Status: Obsolescent

The Scottish Region style of reflectorised P.S.R. indicator (see [13.43]) was adopted as the standard throughout B.R. c.1987. Concurrently, a new design of standard differential speed restriction sign was introduced in which both speeds are exhibited on a single board and separated by a horizontal bar [13.59]. In areas of limited clearance, an elliptical sign may be used [13.60].

[13.59] Standard Differential Permanent Speed Restriction Sign. Click Here for Photo
Area: All Areas   Usage: High   Status: Current
[13.60] Standard Differential Permanent Speed Restriction Sign for use in areas of limited clearance.
Area: All Areas   Usage: Medium   Status: Current

The new signs for non-standard differential speed restrictions are based on the standard circular speed sign, with the addition of identifying letters [13.61]. An elliptical sign is available for areas of limited clearance or for speeds composed of three figures, e.g. "100" [13.62]. Unlike earlier signs applicable only to HSTs (see [13.32 & 13.37]), the new signs do not override any subsequent signs indicating a lower speed; there is therefore no equivalent to the termination sign (see [13.33 & 13.38]).

The types of trains to which the signs may apply are identified by the codes below:

Generally where these signs are installed, a higher speed applies to the specified type of train indicated, except that a lower speed may apply where "LH", "LUL", "CS" or "S7" is shown [13.63]. Class 185 'Desiro' diesel multiple units, introduced in 2006, are not permitted to run at higher speeds shown on "MU" or "DMU" signs. Exceptionally, more than one code may be displayed on a sign [13.64].

[13.61] Non-standard Differential Permanent Speed Restriction Sign. Click Here for Photo
Area: All Areas   Usage: High   Status: Current
[13.62] Non-standard Differential Permanent Speed Restriction Sign.
Area: All Areas   Usage: High   Status: Current
[13.63] Non-standard Differential Permanent Speed Restriction Sign (e.g. lower speed applicable to LUL trains).
Area: All Areas   Usage: Medium   Status: Current
[13.64] Non-standard Differential Permanent Speed Restriction Sign.
Area: St. Pinnock - Largin   Usage: Low   Status: Historical