SNAFU?
As it happens, the station code for Sandal & Agbrigg is SNA...
... but I can't think of a reason for FU to be added to the end :-)
A train with supernatural powers of prediction features in today's edition of signage behaving strangely. Who would could have known that the electronic information panel was warning passengers of what was to come? Spotted by a Register reader at Euston station, the sign on the side of the old London Midland train is what we …
My nephews were greatly amused to see the letters FFS written on Swiss trains.
The Swiss may think it means 'Ferrovie federali svizzere' (thanks Wikipedia) but my nephews were having none of it.
Wait until they find out that everyone in Lausanne has VD (on their licence plates).
Almost certainly set by one of the onboard the staff:
A guard managed to set the sign on a class 444 (same basic Siemens Desiro type) to 'TrainyMcTrainFace'
https://www.independent.co.uk/news/uk/trainy-mctrainface-south-west-trains-commute-boaty-mcboatface-waterloo-a6947831.html
I've also seen them set to other similar custom messages as 'Starlight Express' and 'Night Night'
Six or seven years ago, when Hwy 121 between Sonoma & Napa was a construction zone, I witnessed one of those programmable road signs on a trailer scrolling "DANGER! Badgers and Hedgehogs crossing!"
Yes, I know how to do it (the control box is almost never locked). No, it wasn't me.
DEC VAX ... Failed Unibus Address Register.
See also the metasyntactic variables foo, bar and baz, etc. etc. ...
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Spoiler: It's all metasyntactic variables, all the way down.