Jim Glover is an engineer in charge of constructing a railroad to the sea. He gives the company president Gage a tour of the area of land coveted for its use as a short cut that can save hours on the journey. After the officials visit a recently constructed dam, the train makes a stop in a dull town, and Gage's daughter Laura throws a charity bazaar to combat the boredom. Jim puts together a mock-holdup that saves the event from financial ruin, endearing Laura to him. Later, an accident traps three workers in a cave, and Jim is called away to rescue the victims.

Follows a group of navvies as they work on completing the last great railway through the Swedish wilderness.