It served the Suncook River valley region in central New Hampshire, stopping in key communities such as Allenstown, Epsom, Pittsfield, and Barnstead.

The route of the fabled Blueberry Express was first suggested in January 1849, when a charter was granted by the state of New Hampshire to John Berry to build a railroad from east of Concord into the Suncook Valley to Pittsfield.

A second charter was granted in July of that same year for a second investment group to extend the rails from Pittsfield to connect with the Dover and Winnipesogee Railroad (modern spelling Winnipesaukee) at an undetermined point near the village of Alton Bay.

Ground was broken April 26, 1869, the company was leased to the Concord Railroad November 11, 1869, and the first Suncook-Pittsfield round trip took place on December 6 of that year.

As the new decade proceeded, the B&M sought to shed the expense of running into the Suncook Valley region and petitioned for abandonment of its operation of the line on July 26, 1924.

Arrangements were made with the B&M to lease a locomotive and passenger equipment, and New Hampshire's first independent shortline began operating at noon on September 28, 1924.

Consequently, after SV management successfully completed negotiations to lease the Loop, Suncook Valley trains began operation into Concord, NH, on June 8, 1936.

Perennially strapped for cash, but offered a promise to continue operations, the local stock holders accepted, and Pinsly took control in October.

During the 1930s, the Suncook Valley hosted a series of railfan excursions, bringing in an unusual influx of rented equipment for the day, in addition to some much needed extra revenue.

The first was hosted on November 4, 1934, by the National Association of Railway Enthusiasts, it being only their second excursion after a trip on the Hoosac Tunnel and Wilmington Railroad just earlier that year.

The Suncook Valley had little need for the expense of an extensive freight car fleet with an ample supply of equipment available from the B&M yard at Concord.

Passenger and milk traffic declined early, a result of the shorter distances and quicker transit times offered by motor vehicles and improved roads.

The SV was charming and notable for such reasons as the use of steam power well after World War II (until 1949), its daunting switchback gaining access to the route in Suncook village, its first-of-a-kind independent status, and the never-say-die frugality that defined life in rural New Hampshire.