Phill Dyson said:
Does anyone have a headcode book ? , I would quite like to know what they all mean too :scratch: . The Hymek in front of me is 1V45 at one end & 1B67 at the other end.......no idea what they are though ???
The first number is the class of the train, so a 1 is express passenger, 2 local passenger and so on down to 9 for unfitted stopping freights. The numbers are important, as they assign priority - a breakdown train going to assist is class 1, for example. 0 (light engine) is effectively a 10 in this scheme.
The letters denote destination, A and B are usually reserved for London (and sometimes C, I think) Z for specials, X for royal trains, and various letters for regions:
E - Eastern
M - Midland
N - North Eastern
O - Southern
S - Scottish
V - Western.
Although I said destination, a train going from St. Pancras to Manchester via Sheffield would pass through the Eastern region, and would get an E. (I think.)
The two digits can be train number, route number or duty, depending sometimes on local regional variations: often positive and negative were used for up and down indications.
For example, on the AC lines of LMR, 2B23 was a Euston bound EMU service from Birmingham, the return being 2G33 regardless of what time it ran at. 9T49 was (unfitted) trip working number 49, a specific duty: I think in Nottingham. 1P42 would be an inter-city service to the Preston area, 1H44 to the Manchester area: not sure how they allocated the numbers for these.
Headcodes could vary from time to time, particularly with the classification of freight trains, and sometimes with divisional/regional changes. I am told by a friend who is a signaller that now the class of the train reflects the maximum speed, as all trains are now fully air-braked, and priority usually goes to the fastest as it is easier and less time consuming to put a slower train into a loop - usually.