Camerons on the Train by Jane Duncan.
 
You might not think that a first solo train journey would be a great event in the lives of the three Cameron children. After all, there's got to be a first time for everything and the Camerons were neither complete fools nor terrific brains-pretty ordinary really.
 
But that train journey from Inver-dariot to Jennyville in the North of Scotland started an avalanche which was so extraordinary that the Camerons have never been the same since.
 
Illustrated by Victor Ambrus