The Greenwich and Johnsonville Railway (reporting mark GJ) was a railroad in Upstate New York.

[1] At the turn of the twentieth century the company extended its line west from Greenwich to Schuylerville, New York, to connect with the Boston and Maine's Saratoga branch.

It chartered the Battenkill Railroad for this purpose on December 15, 1902, and consolidated that company on August 12 the following year when the 7-mile (11 km) branch opened.

[5][1] The Delaware and Hudson took an interest in the small railroad, and in 1906 bought up the Greenwich and Johnsonville's capital stock, acquiring complete control.

[8] The D&H made little use of the connection with the B&M at Schuylerville, and cut the line back to Thomson after the bridge over the Hudson River washed out.