I thought I had already posted a picture of the signal box at Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch (I hope I have transliterated it correctly), but apparently not. I like the way that British Rail (presumably the London and North Western Railway which operated the line from Euston to Holyhead) has taken the trouble to print an English translation, even in spite of the fact that the full name is bogus, the invention apparently of a local tailor:-
On the front of the box, the village name has been abbreviated, using commas in place of full stops:-
| Charles | Saumarez | Smith | 
We always enjoy your reports from Anglesey and make notes on places to see on our annual visit .
My husband , who was born on the island , tells me that the company running the service to and from London was the London, Midland and Scottish Railway.
Your husband is right. The LMS took over the LNWR in 1923 and the sign probably postdates that, although the signal box itself is much earlier.