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Section 13; pages:
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2,
3,
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5,
6
Section 13: Permanent Speed Restriction Signs
(Page 4 of 6)
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Exceptionally, a non-standard differential speed restriction may be indicated by a cut-out style sign [13.60].
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[13.60] Non-standard Differential Permanent Speed Restriction Sign.
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Local variations exist in the signage of non-standard differential P.S.R.s, where the two speeds were combined on a single sign [13.62 - 13.64] or advance warning indicator [13.65 - 13.67].
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[13.62] Non-standard Differential Permanent Speed Restriction Sign (combined).
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[13.63] Non-standard Differential Permanent Speed Restriction Sign (combined).
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[13.64] Non-standard Differential Permanent Speed Restriction Sign (combined).
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[13.65] Advance Warning Indicator applicable to a non-standard differential permanent speed restriction (combined).
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[13.66] Advance Warning Indicator applicable to a non-standard differential permanent speed restriction (combined).
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[13.67] Advance Warning Indicator applicable to a non-standard differential permanent speed restriction (combined).
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One variant type of combined non-standard differential speed restriction sign has the code letters indicating the type of train written as a suffix after the relevant speed [13.68].
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[13.68] Non-standard Differential Permanent Speed Restriction Sign (combined).
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On parts of the Eastern Region (Great Eastern Line and branches), a single-letter suffix after the lower figure (higher speed) indicates the type of train to which the restriction applies [13.69 & 13.70]. The suffixes used on these signs are:
- "M" = Multiple Unit Trains
- "D" = Diesel Multiple Unit Trains
- "E" = Electric Multiple Unit Trains
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[13.69] Non-standard Differential Permanent Speed Restriction Sign (Great Eastern Line).
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[13.70] Non-standard Differential Permanent Speed Restriction Sign for use in areas of limited clearance (Great Eastern Line).
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Up to a maximum of three different speeds may be displayed on signs at any one location, i.e.:
- One standard differential + one non-standard differential, or
- One plain P.S.R. sign + one or two non-standard differentials.
During the late 1980s, while countdown markers were being installed on the approach to certain signals (see Section 8), it was considered that it could, in some circumstances, be beneficial to provide a similar series of markers on the approach to a reduction in maximum permissible speed. The markers, introduced from 1989, have diagonal black stripes on a white background [13.71]. These were installed on the East Coast Main Line approaching Grantham (in both directions), where the permissible speed reduces from 115 m.p.h. to 100 m.p.h.
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[13.71] P.S.R. Countdown Markers ( (a) - Outer board; (b) - Intermediate board; (c) - Inner board ).
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Since the opening of the Channel Tunnel in 1994, linking Great Britain with France, there has been a need for permissible speed information to be presented in both miles per hour (MPH) and kilometres per hour (KMH). Signs showing both were provided in the vicinity of the Channel Tunnel terminal at Dollands Moor and Cheriton for the benefit of continental drivers working into the U.K. [13.72 & 13.73].
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[13.72] Permissible Speed Sign showing both MPH and KMH.
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[13.73] Advance Warning Indicator showing both MPH and KMH.
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Another form of non-standard differential speed restriction sign exists at Old Oak Common (Great Western Zone) [13.74]. "T" = 'Turbo' (Class 165/166).
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[13.74] Non-standard Differential Permanent Speed Restriction Sign. Lower figure (higher speed) applies to HSTs and Turbos.
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