This short little ditty was often used as a "going-to-bed" song in the Grainger family in the mid- to late-1940's. I didn't especially like it as it signified going to bed when there were much more interesting things to do. My mother learned it herself from other children as a small child and her version can be found in A Mum's (Mostly Musical) Memories.

Early in the morning down by the station,
See the little puffer-billies all in a row.
See the little engine-driver turn the little handle,
Puff, puff, puff and away we go.

WOOH-OOH-WHOO!