in a seamless operation. Route Main line NBSR's main line begins at Mile 0 of the McAdam Subdivision at Mill Street in Saint John, extending 84.4 miles to the yard at McAdam. This trackage continues another 5.6 miles on the Mattawamkeag Subdivision from McAdam to the International Boundary at the Saint Croix-Vanceboro Railway Bridge where it continues into the United States as the EMRY. East of Mill Street are the tracks of CN with which the NBSR interchanges daily. The tracks between Saint John and St. Croix were built as part of the European and North American Railway's "Western Extension" which was part of a project that connected Saint John, New Brunswick with Bangor, Maine, opening in 1869. This line ended up becoming part of the New Brunswick Railway in 1883 and in turn part of the Canadian Pacific Railway in 1890. One distinctive section of NBSR's main line is its crossing over the Saint John River approximately west of Mill Street where it crosses the Reversing Falls gorge on the Reversing Falls Railway Bridge. The current bridge structure dates to 1922. Branch lines NBSR has three branch lines: West Saint John Spur, running approximately from the main line at Fairville in the western part of the city of Saint John. The West Saint John Spur serves the west side of the Port of Saint John, including the Rodney Container Terminal, the Forest Products Terminal (FORTERM), and several industrial customers. The tracks forming the West Saint John Spur were built as the Carleton, City of Saint John Branch Railroad in the early 1870s and acquired by CPR in the 1890s. St. Stephen Subdivision, running approximately from the main line at McAdam to the town of St. Stephen. The tracks between McAdam and St. Stephen were built as part of both the St. Andrews & Quebec Railway, New Brunswick & Canada Railway and the Grand Southern Railway; all were acquired by NBR or CPR at various times through to 1911. Milltown Spur, running approximately from the St. Stephen Subdivision in the town of St. Stephen and loops around the town to end at the halfway point of an unnamed railway bridge over the St. Croix River at the International Boundary. The other half of this bridge is owned by Woodland Rail LLC which owns a small portion of a former Maine Central Railroad line from Calais, Maine to Woodland, Maine; this