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|Uncoloured || 14 tons
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Certain routes could be modified as “dotted”"dotted", for example "Dotted Blue" meant a route could be worked by "Blue" locomotives but subject to a 25mph speed restriction. Locomotives in the lower "Yellow" and "Uncoloured" classes could work the route without this additional speed restriction.
The axle weight was the main factor used in determining route colour, but this could be varied where it was considered appropriate. An example of this was the 5700 class pannier tanks, which were reclassified from "Blue" to "Yellow" by BR(W) in 1950. The reason given was the low 'hammer blow' that the class produced, which reduced the wear on the track.
===Severn Valley Railway Route Classification===
During the Second World War, in order to meet wartime requirements, the line was raised from a yellow to a blue route (although restricted to engines with a maximum axle loading of 17½ tons), before eventually becoming a dotted blue route.<ref>[[Bibliography#Books|Smith (1968)]] pp. 24-25.</ref><ref group="note">Marshall refers to the line as 'dotted blue' without stating that it was a 'yellow' route pre-War, however the absence of evidence of blue rated locomotives prior to that time suggests this was the case.</ref> The post-War classification and rules for working the Severn Valley Railway were set out in Section 15 of the 1948 Working Timetable as follows:
:''' ''Dotted "Red" route – Hartlebury and Bewdley'' '''<br>
The Light Railway Order under which the SVR operates specifies a maximum speed of 25mph for normal services. Operation up to 50mph may be carried out between Kidderminster and Bewdley when the railway is closed to the public; a recent example being the testing of Metropolitan Railway 0-4-4T No 1 in 2012 prior to its participating in the London Underground events in 2013.
==Notes==
<references group="note"/>
==See also==