The Pixies "Candy Line Express"

The Pixies was published by Magazine Enterprises, debuting in 1946. The series lasted five issues, returning in the 1955 as "Pee-Wee Pixies" and then "The Mighty Atom" through different publishers but just reprinting the original stories.

In this story, the first in the first issue, the Pixies are out of candy and everything else sweet because they are out of sugar. To get sugar, Pete takes it upon himself to build a railroad and a train. When the engine turns up missing, Pete becomes The Mighty Atom to find it. Wait. What?