the Crewe (and Stoke) letter K for its destination. As it is a late evening service, the two digits on the end of the headcode are higher. Its headcode is 1K77. In some areas, more particularly with local services, some services will recycle headcodes. For example, the 06:11 Arriva Rail North Colne to Preston service has the headcode 2N81, followed by the 07:09 service which has the headcode 2N82. Subsequent services are numbered consecutively up to 2N89, before the numbers are recycled with the 16:11 departure also having the headcode 2N81. The china clay train from Cliffe Vale to St Blazey is limited to 60 mph, so it is a class 6 train. It is going to the Western region, and its headcode is 6V70. However, if 6V70 ran with a different, slower set of wagons restricted to 45 mph, it could run as 7V70, and if no wagons needed to be moved, it could run as 0V70 (engine only). Special numbering It is common practice for empty coaching stock (class 5) trains on the way to form a service or returning to depot having completed a service to run with the same code as that service, with the 5 prefix. Similarly, locomotives on the way to pick up or having dropped off a train, or running round to change the direction of travel, are given the train number but with a 0 prefix. An unusual situation arose with the opening of the Channel Tunnel: many continental train reporting numbers are all numeric. Eurostar trains therefore have a 9Oxx or 9Ixx reporting number in Britain and a corresponding 90xx or 91xx number in Europe, neatly utilising the similarity between the letters O and I and the numbers 0 and 1 to unite the two reporting number systems. Some passenger services operate with class 9s to differentiate them from other services. Trains with some specific requirements, such as out-of-gauge loads or the Royal Train, run with the letter X, and special trains not in the regular train service (e.g. charters, railtours, emergency trains or as-required locomotive moves) have Z. Automatic Route Setting code prevents the automatic routing of trains with the letter X in their headcode and signallers must route these trains manually. The GNER White Rose service from London King's Cross to Leeds formed of a 16 carriage Regional Eurostar set ran with a prefix of 1X due to the