Big Fill

The Big Fill was an engineering project on the First Transcontinental Railroad in the U.S. state of Utah. To avoid a costly 800-foot (240 m) tunnel through mountainous terrain east of Promontory Summit, Central Pacific engineers mapped an alternate route that still needed to span the deep Spring Creek Ravine.

Big Fill

The Big Fill was an engineering project on the First Transcontinental Railroad in the U.S. state of Utah. To avoid a costly 800-foot (240 m) tunnel through mountainous terrain east of Promontory Summit, Central Pacific engineers mapped an alternate route that still needed to span the deep Spring Creek Ravine.