The track from the south into Grand Rapids was completed September 13, 1870. The line extended north to
Big Rapids, Michigan, by October 1, 1870, and a train first traveled between Fort Wayne and Big Rapids on that date. In June 1871, the Grand Rapids and Indiana Railroad Company took control of the road and property of the Cincinnati, Richmond and Fort Wayne Railroad Company, extending the line south to
Cincinnati. The
Traverse City Rail Road Company, a branch providing service between
Walton Junction on the main line to
Traverse City, was completed in December 1872, bringing a wave of immigration to that area. This branch offered service to Traverse City,
Northport and many towns between by 1909. The line between Paris and
Petoskey, Michigan, was completed November 25, 1873. The road was opened to
Mackinaw City, Michigan, and the Straits of Mackinac on July 3, 1882. The total length of the line at this time was . In 1886 the company added an "airline" branch from Grand Rapids to
Muskegon, Michigan, allowing travel between the two cities in about 1 hour. As of July 1888, the railroad had expanded its fleet to 66 locomotives and 3,100 cars. Its gross earnings were close to $2.3 million in 1887. In 1891 the Grand Rapids and Indiana Railroad featured the longest north–south line in the country. The railroad served to accelerate the settlement of
Northern Michigan, which was largely a wilderness in the mid-19th century. On July 2, 1896, the Grand Rapids & Indiana Railroad reorganized as the Grand Rapids and Indiana Railway. == Lumber to tourism ==