Question: Name the railroad in Canada which is a short line railway operating between Portland, Maine on the Atlantic Ocean and Montreal in Quebec which had Coaticook station on its west side completed in 1853?

Context paragraphs:
Oregon Short Line Railroad: The Oregon Short Line Railroad (reporting mark OSL) was a railroad in the U.S. states of Wyoming, Idaho, Utah, Montana and Oregon.  The line was organized as the Oregon Short Line Railway in 1881 as a subsidiary of the Union Pacific Railway.  The Union Pacific intended the line to be the shortest route ("the short line") from Wyoming to Oregon.  In 1889 the line merged with the Utah & Northern Railway and a handful of smaller railroads to become the Oregon Short Line and Utah Northern Railway.  Following the bankruptcy of Union Pacific, the line was taken into receivership and reorganized as the Oregon Short Line Railroad.

Sümerbank Branch: The Sümerbank Branch locally referred to as the Gıdıgıdı as in Chug chug (Turkish: "Sümerbank Nazilli Banliyösu" ), was a short line railway operating in Nazilli, Turkey.  The railway was built in 1937 to shuttle workers at the Sümerbank factory to the Nazilli railway station.  Sümerbank owned and operated the railway, using a Ruston shunting engine and a single railcar from the Oriental Railway Company.

Goderich–Exeter Railway: The Goderich–Exeter Railway (reporting mark GEXR) is a short line freight railway that operates around 181 mi of track in Southern Ontario.  Created in 1992, it was the first short line railway in Canada to be purchased from a class I railway, in this case Canadian National Railway (CN).  It took over operation of further CN trackage in 1998.  As of 2004, the railway has 44 employees.  It is headquartered in Stratford, Ontario, and owned by short-line railroad holding company Genesee & Wyoming.

St. Lawrence and Atlantic Railroad: The St. Lawrence and Atlantic Railroad (reporting mark SLR) , known as St-Laurent et Atlantique Quebec (reporting mark SLQ) in Canada, is a short line railway operating between Portland, Maine, on the Atlantic Ocean and Montreal, Quebec, on the St. Lawrence River.  It crosses the Canada–US border at Norton, Vermont, and is owned by short line operator Genesee and Wyoming.

Wabush Lake Railway: The Wabush Lake Railway (reporting mark WLRS) (formerly WABL and NLCL) is a short line railway operating in the province of Newfoundland and Labrador, Canada.

Coaticook station: Coaticook station is a historic building in the small town of Coaticook, Quebec, Canada, close to the border with the United States.  The first station, which was on the west side of the tracks, was completed in 1853 by the St. Lawrence and Atlantic Railroad.  The current building was constructed on the east side of the tracks in 1904 by the Grand Trunk Railway.  The two storey wooden frame building has a single storey conical roofed southerly end and a small extension on the north end.  One of the façades includes a two-story bay window topped by a gable-pediment.  The old station is located in a semi-wooded area in a residential area of the town.

Oregon, Washington and Idaho Railroad: The Oregon, Washington and Idaho Railroad built a 72.03 mi rail line along the right (north) bank of the Snake River between Riparia, Washington and Lewiston, Idaho.  The company was incorporated in Oregon on August 8, 1903, and began operating its completed line on July 7, 1908 as an operating subsidiary of the Union Pacific Railroad (UP), which also controlled the Oregon Railroad and Navigation Company (OR&N) through Riparia.  A portion of the preliminary work had been done by the Snake River Valley Railroad, which built a completed line along the Snake River below Riparia.  Beginning on December 3, 1909, the Camas Prairie Railroad, a joint subsidiary of the OR&N and Northern Pacific Railway (NP), began operating the Oregon, Washington and Idaho Railroad (OW&I) as part of a line between Riparia and Grangeville, Idaho, including segments owned by the NP and subdidiary Clearwater Short Line Railway.  On December 23, 1910, the property of the OW&I was conveyed to new UP subsidiary Oregon–Washington Railroad and Navigation Company, successor to the OR&N, but the Camas Prairie Railroad continued to operate it as agent.

Southern Railway of British Columbia: The Southern Railway of British Columbia, branded as SRY Rail Link (reporting mark SRY) is a Canadian short line railway operating in the southwestern British Columbia.  The main facility is the port at Annacis Island with major import of cars, export of forestry products, and other shipments.  The railway has interconnections with three Class I railroads, including Canadian Pacific (CP), Canadian National (CN) and Burlington Northern Santa Fe (BNSF).  It operates a fleet of 29 locomotives, mostly consisting of EMD GP-9 & SW900 locomotives.  It also rosters 5 unique Ex.  Canadian National Railway GMD-1 locomotives, and also runs 3 SD38-2 locomotives, and 1 SD38AC.  The railroad also operates a fleet 2,000 rail cars, SRY hauls approximately 70,000 carloads per year.  It operates around 123 mi of track, 62 mi of which is mainline track.

Bloom Lake Railway: The Bloom Lake Railway (reporting mark WLRS) (formerly BLRC) is a privately owned Canadian short line railway operating in the province of Newfoundland and Labrador and Quebec.

Rockland Branch: The Rockland Branch is a railroad from Brunswick, Maine to Rockland, Maine.  A charter was granted in 1849 to build a railway from the Portland and Kennebec Railroad on the west side of the Kennebec River to Rockland.  Construction through the rocky headlands of the Atlantic coast proved more expensive than anticipated.  The Knox and Lincoln Railroad commenced service to Rockland in 1871 using a ferry to cross the Kennebec River between Bath and Woolwich.  The Knox and Lincoln was leased by Maine Central Railroad in 1891, and became Maine Central's Rockland Branch in 1901.  Maine Central purchased the Samoset destination hotel in nearby Glen Cove (a part of neighbouring Rockport) in 1912, and offered direct passenger service for summer visitors from the large eastern cities.  Carlton bridge was completed in 1927 to carry the railroad and U.S. Route 1 over the Kennebec River.  Maine Central sold the Samoset hotel in 1941, and the last Maine Central passenger train to Rockland was on 4 April 1959.  The State of Maine purchased the branch in 1987 to prevent abandonment.  The line has subsequently been operated by the Maine Coast Railroad, the Maine Eastern Railroad, and, beginning in 2016, the Central Maine and Quebec Railway.

Supporting paragraphs: Coaticook station St. Lawrence and Atlantic Railroad
Answer: St. Lawrence and Atlantic Railroad