sounds like pr0n to me
Probably a euphemism for this https://www.theregister.com/2019/05/13/london_rail_passengers_played_pron_noises_over_tannoy/
Come join your friends at The Register on a train journey to Bork. Or at least one to destination Aborted. Spotted by Register reader Ian – who resides in that trainspotter's paradise, a house beside a siding – something is not well with the South Western Railway train. Unless "Preinst aborted" is a station of which we are …