The Wolverine is a passenger train service operated by Amtrak as part of its Michigan Services. The 304 miles (489 km) line provides three daily round-trips along the Pontiac–Detroit–Chicago route. It carries a heritage train name descended from the New York Central (Michigan Central).

During fiscal year 2011, the Wolverine carried 503,290 passengers, a 4.9% increase from FY 2010's total of 479,782 passengers. The service had a total revenue of $18.8 million in FY 2011, a 11% increase from FY 2010's $16.9 million total revenue.

The Wolverine operates over Norfolk Southern Railway, Amtrak, and Canadian National Railway trackage:

The Detroit–Chicago corridor has been designated by the Federal Railroad Administration as a high-speed rail corridor. A 97-mile stretch along the route of Wolverine from Porter, Indiana to Kalamazoo, Michigan is the longest segment of track owned by Amtrak outside of the Northeast Corridor. Amtrak began speed increases along this stretch in January 2002. Amtrak trains currently travel at top speeds of 110 miles per hour along this section of track. During October 2010, the State of Michigan received $150 million from the federal government to increase track speeds to 110 mile-per-hour service between Kalamazoo and Dearborn.

The wolverine, pronounced /ˈwʊlvəriːn/, Gulo gulo (Gulo is Latin for "glutton"), also referred to as glutton, carcajou, skunk bear, or quickhatch, is the largest land-dwelling species of the family Mustelidae (weasels). It is a stocky and muscular carnivore, more closely resembling a small bear than other mustelids. The wolverine has a reputation for ferocity and strength out of proportion to its size, with the documented ability to kill prey many times its size.

The wolverine can be found primarily in remote reaches of the Northern boreal forests and subarctic and alpine tundra of the Northern hemisphere, with the greatest numbers in northern Canada, the U.S. state of Alaska, the Nordic countries of Europe, and throughout western Russia and Siberia. Their populations have experienced a steady decline since the 19th century in the face of trapping, range reduction and habitat fragmentation, such that they are essentially absent in the southern end of their European range. It is, however, estimated that large populations remain in North America and northern Asia. Wolverines are solitary animals.

A railway or railroad train is a connected series of vehicles for rail transport that move along a track (permanent way) to transport cargo or passengers from one place to another place. The track usually consists of two, three or four rails, but might also be a monorail or maglev guideway.

Propulsion for the train is provided by a separate locomotive, or from individual motors in self-propelled multiple units. Most modern trains are powered by diesel locomotives or by electricity supplied by overhead wires or additional rails, although historically (from the early 19th century to the mid-20th century) the steam locomotive was the dominant form of locomotive power. Other sources of power (such as horses, rope or wire, gravity, pneumatics, batteries, and gas turbines) are possible.

The word 'train' comes from the Old French trahiner, itself from the Latin trahere 'pull, draw'.

There are various types of trains that are designed for particular purposes. A train can consist of a combination of one or more locomotives and attached railroad cars, or a self-propelled multiple unit (or occasionally a single or articulated powered coach, called a railcar). Trains can also be hauled by horses, pulled by a cable, or run downhill by gravity.