That's from "The Dream Song", showing the engines' fears of what might happen to him if the railway was shut down/closed.
James' dream: (SORRY I CAN'T DESCRIBE IT TTMTT)
Edward's dream: Edard is a scarecrow.
Gordon's dream: Gordon is a playground for children.
Percy's dream: PERCY IS ON A ROLLER COASTER FOR LOCOMOTIVES WITH SOME SCARY LOOKING EYE LOOKING GOGGLES-
Lyrics:
As the night begins to creep
Fast across the sky
The engines start their troubled sleep
And here's the reason why...
Roll up! Roll up!
Have a try, go on, take a shy
Roll up! Roll up!
Have a throw, have you had a go?
Remember how James was so proud and so vain?
Look at him now; well, he won't be again
Queue up! Queue up!
Take a swing on this RUSTY THING!
Queue up! Queue up!
Have you tried? Go on, have a slide
Remember how Gordon was king of the track?
Look at him now; oh, there's no going back
Who's that? Who's that?
Scaring crows where the barley grows?
Who's that? Who's that?
Growing weeds where they're sowing seeds?
Remember how Edward would help and he'd share?
But Farmer McColl doesn't now seem to care
Roll up! Roll up!
Take a ride on a scary side
Roll up! Roll up!
IT"S A THRILL WHEN HE TAKES A SPILL!
Remember how Percy took mail there on time?
For all of these engines, i t ' s t h e e n d o f t h e l i n e . . .