2-Character Headcodes for DMUs
As well as being allocated a standard 4 character train identification number, DMUs were also given a 2-character code. This was intended to be displayed in the 2-position 'indicator boxes' most DMUs working in North Wales had below the cab windows.
The first position indicated the class of train.
A - Express Passenger - equivalent to Class 1
B - Ordinary Passenger - equivalent to Class 2
C - Empty Stock = equivalent to Class 5
In the 1976 timetable almost all DMU passenger workings ran as Class 'B' (i.e Class 2).
The second position was used to indicate route, as shown in the table below:
|Trains between||and||Route Identification Number|
|Crewe / Blythe Bridge||1|
|Crewe / Stoke-on-Trent||6|
|Liverpool Lime Street||5|
|Manchester Oxford Rd||3|
|Helsby||Hooton / Rock Ferry||2|
|Hawarden Bridge||Wrexham Cent||3|
|New Brighton||Wrexham Cent||4|
|Birkenhead North||Wrexham Gen / Cent||5|
|Wrexham Gen||Wrexham Cent||0|
DMU Route indication codes last appeared in the working timetables in 1977-78, but they were little used for some time before this - this is the only picture I have of a DMU in 1975 or 1976 showing the correct code, at Harlech in 1976
More typical, this Metro-Cammell dmu seen at Morfa Mawddach in August 1975 shows Route 9 which is 'Llandudno-Manchester Victoria' - it should have carried 'B2'. Then again, only the Dovey Junction signalman would have gained anything!
When DMU refurbishment started in 1976 the headcode panels were removed, as seen here, taken on 6th September 1976 at Bangor. The DMUs are running through the station to reverse into Platform 1 to form the 1640 to Crewe.