...as the 24 hours is up...
Euston (Approach Road)
Elstree and Borehamwood.
Indeed - leaving (rather surprisingly!) number 1 to answer.
The destinations listed on the stone columns at Euston include some reminders of the past, and perhaps reflect some considerable optimism in looking towards distant markets. Or perhaps not so optimistic - I can recall the days that trains ran from Waterloo to Manchester, from Waterloo to Paris, and from Paddington to Minehead and Glasgow.