Field,Field Description,Length,Position,Notes
1,Record Identity,2,1-2,With the constant value ‘BX’.
2,Traction Class,4,3-6,Not used – always blank.
3,UIC Code,5,7-11,"Only populated for trains travelling to/from Europe via the Channel Tunnel, otherwise blank."
4,ATOC Code,2,12-13,
5,Applicable Timetable Code,1,14-14,Always set to ‘Y’.
6,Retail Service ID,8,15-22,
7,Source,1,23-23,Not used – always blank.
8,Spare,57,24-80,