CAPE was the old railway telegraphic term for ‘The following train is cancelled...’ Even long after the telephone took over, it was still used for telephone messages as it was quick and clear. Another was BOXER ‘The following message is to be passed from signal box to signal box.’ I have numerous times had the ‘phone ring, picked it up, been told ‘BOXER. CAPE 1B45‘ and then got on the ‘phone to the next box and repeated the message. I don’t think that it stood for anything: it was just a short and clear word.
By the 1980s most of the others had fallen out of use as far as signalmen were concerned, although there was still an old book containing hundreds of words, many totally obsolete, in many boxes. The only two I can remember using were HANOVER ‘The following train will run in two portions...’ and URE ‘Special attention is to be paid to the working of the following train...’ (The latter was seen as ‘Member of the board on his way home.’) All from memory.