I'm interested to know the minimum age for volunteer crews on any heritage railways large and small. The NYMR have 16 for firemen and 21 for drivers. Not sure about guards. Middleton has 21 for drivers and 18 for firemen and guards. I recall that the TR had 13 year old firemen many years ago. I certainly started my footplate career well before 16 but that was before people were bothered about such things. Just curious as to what happens elsewhere.