Union Pacific EC-4, a track inspection vehicle built by Plasser & Theurer, tests track through Woodford, California, on the line over Tehachapi Pass on March 7, 2001. The unique car is passing BNS... (more)

Northbound EC-4 Track Inspection Unit at Seacliff Siding.

UP's Track Inspection unit west bound on on main 1 as it passes Riverdale Yard in Ogden

UP's EC-4 makes its way north, just feet away from the Wisconsin state line.

UP track inspection vehicle approaches Dry Lake Nevada

UP EC-4 works eastbound through Ames this morning.

UP track geometry car passing through Fremont while inspecting the Oakland Sub from Lathrop to Oakland.