book of signs (page 150)

here is a sign i saw in paddington station this morning.
this sign must be a temporary measure until the engineers come to mend the escalators. yet it’s been professionally produced. it would have probably been quicker to mend the escalator.
then i noticed it said ‘page 150’ on the bottom left hand corner. i suspect there is a giant book of very specific signs issued to train station managers and they just wrip out the relevant page.
that book must be massive. i shall endeavour to find other pages from this book and report them to you as and when.