Golden Spike TowerThe Golden Spike Tower in North Platte, Nebraska, rises 8 stories above Union Pacific’s 2,850-acre Bailey Yard.
Bailey Yard is the world’s largest railroad classification yard. Personnel there sort, service and repair locomotives and cars headed all across North America. Owned and operated by the Union Pacific Railroad (UP), Bailey Yard is located in North Platte, Nebraska. The yard is named after former Union Pacific president Edd H. Bailey.

An average of 139 trains and over 14,000 railroad cars pass through Bailey Yard every day, and the yard sorts approximately 3,000 cars daily using the yard’s two humps. The eastbound hump is a 34 feet (10 m)-tall mound and the westbound hump is 20 feet (6.1 m) high.

These are used to sort four cars a minute into one of the 114 “bowl” tracks, 49 tracks for the westbound trains and 65 for eastbound. The bowl tracks are used to form trains headed for destinations across North America, including the East, West and Gulf coasts of the United States, and Canadian and Mexican borders.

The yard also includes 3 locomotive fueling and servicing centers called eastbound run thru, westbound run thru, and the service track that handles more than 8,500 locomotives per month, a locomotive repair shop that can repair 750 locomotives monthly, and a car repair facility that handles nearly 50 cars daily. The car repair shop replaces 10,000 pairs of wheels each year.

The yard features an in-motion wheel defect detector developed by Union Pacific that uses ultrasound technology to inspect each wheel. It is the only such detector in the world. UP has also developed a method for changing wheels in the field on empty westbound coal trains, which enables three workers to use a hydraulic jack under the couplers between two cars and exchange the trucks. This has reduced the time needed to replace trucks from up to 12 days to 8–12 minutes.

(source: WikiPedia)

Take a look at the webcam stream below.

Truly a once in a lifetime experience: The Golden Spike Tower and Visitor Center-more trains than you can keep track of!