The railroad and its accompanying Jay Street Terminal primarily served the Arbuckle Brothers coffee refinery and warehouses in what's now Dumbo and Vinegar Hill, Brooklyn. Founded in Pennsylvania in the mid-1800s, the Arbuckle company was already well-known for its Ariosa blend of roasted beans — especially, so goes the tale, among cowboys in Dodge City, Tombstone, and throughout the American West — when it moved to Brooklyn late in the 19th century. There Arbuckle Brothers introduced an arabica roast called Yuban; though the company didn't outlast the 1930s, Yuban survives as a brand line produced by Kraft.
As for Ariosa, that famed brand has been resurrected by a company called Arbuckle Coffee Roasters, established in 1974 in Tucson, Arizona. If you're behind the wheel rather than up in the saddle, it's just an hour's ride out of Tombstone.
Jay Street Connecting Railroad
Surviving tracks in various locations, Vinegar Hill and Dumbo, Brooklyn