A Norfolk Southern conductor gives the thumbs up to the engineer of a helper tandem after coupling to the end of a westbound intermodal freight train under the Eighth Street Bridge in Altoona on Monday afternoon. Mirror photo by Patrick Waksmunski

A Norfolk Southern conductor gives the thumbs up to the engineer of a helper tandem after coupling to the end of a westbound intermodal freight train under the Eighth Street Bridge in Altoona on Monday afternoon.

Mirror photo by Patrick Waksmunski