Question: The Selkirk Yard is a large reight railroad lacated in Selkirk, New York.What is the name of the 315 mile river that flows from north to south that runs near the Selkirk Yard.

Context paragraphs:
History of the Hudson River: The Hudson River is a 315 mile river in New York.  The river is named after Henry Hudson, an Englishman sailing for the Dutch East India Company, who explored it in 1609, and after whom Canada's Hudson Bay is also named.  It had previously been observed by Italian explorer Giovanni da Verrazano sailing for King Francis I of France in 1524, as he became the first European known to have entered the Upper New York Bay, but he considered the river to be an estuary.  The Dutch called the river the "North River" – with the Delaware River called the "South River" – and it formed the spine of the Dutch colony of New Netherland.  Settlements of the colony clustered around the Hudson, and its strategic importance as the gateway to the American interior led to years of competition between the English and the Dutch over control of the river and colony.

Selkirk hurdle: The Selkirk Hurdle is the term used by urban planners, railroad employees, politicians, and others to describe the route that must be taken by freight trains traveling between New York City and other points in downstate New York that are east of the Hudson River, and locations in the United States to the south and west.  There are no rail freight bridges or tunnels that cross the Hudson River south of Selkirk, which is 10 miles (16 km) south of Albany and the home of Selkirk Yard, a major CSX classification yard.  As a result, trains from Long Island and New York City (except for the borough of Staten Island which has a rail bridge to New Jersey) must travel 140 mi north to cross at Selkirk before continuing on their way.  Advocates claim that this detour and the inefficiencies that result force New York City to rely more heavily on relatively inefficient trucks than most parts of the United States, where freight trains are more common.  However, at least for traffic to and from the west, this route was touted for its efficiency as the "Water Level Route" by the New York Central Railroad because trains using it did not have to climb over the Appalachian Mountains, and it is still used by the New York Central's successor, CSX, for traffic to both sides of the Hudson River.

Ten Mile River (Housatonic River): The Ten Mile River (Tenmile River on federal maps) is a 15.4 mi river that flows through Dutchess County, New York into westernmost Connecticut.  The river is formed in the town of Amenia, New York, at the confluence of Webatuck Creek and Wassaic Creek.  The Ten Mile River runs south through the town of Dover, New York before turning east and crossing into Connecticut, where it forms the boundary between the towns of Kent and Sherman for one-half mile before flowing into the Housatonic River.  This is a popular whitewater paddling destination with mostly quickwater and a few whitewater areas reaching up to Class III.

Selkirk Subdivision: The Selkirk Subdivision is a railroad line owned by CSX Transportation in the U.S. state of New York.  The line runs from Selkirk northwest to Amsterdam along a former New York Central Railroad line.  At its southeast end, at Selkirk Yard, the Selkirk Subdivision becomes the Castleton Subdivision.  Its northwest end is at the east end of the Mohawk Subdivision, and it junctions the Carman Subdivision at Rotterdam and the Hudson Subdivision at Hoffmans.

Hudson River: The Hudson River is a 315 mi river that flows from north to south primarily through eastern New York in the United States.  The river originates in the Adirondack Mountains of Upstate New York, flows through the Hudson Valley, and eventually drains into the Atlantic Ocean, between New York City and Jersey City.  The river serves as a political boundary between the states of New Jersey and New York, and further north between New York counties.  The lower half of the river is a tidal estuary occupying the Hudson Fjord, an inlet which formed during the most recent period of North American glaciation, estimated at 26,000 to 13,300 years ago.  Tidal waters influence the Hudson's flow from as far north as Troy.

Pavonia Yard: Pavonia Yard is a rail yard in Camden, New Jersey.  It was built by the Pennsylvania Railroad (PRR) and opened in 1888.  The yard begins just north of where the Conrail tracks cross the Cooper River near the intersection of State and Federal Streets, and continues north until approximately 36th Street, ending near the 36th Street River Line station.  The yard was used to interchange with the West Jersey and Seashore Railroad (WJ&S) during 1896 to 1932, and with the Pennsylvania-Reading Seashore Lines (P-RSL) during 1932 to 1976.  Initially the PRR operated large locomotive and car repair shops at the yard.  In later years the engine work was discontinued, but the car repair shops remained in operation through the late 1930s.  The yard was rebuilt in the 1960s.

Selkirk Yard: Selkirk Yard is a large freight railroad yard located in Selkirk, New York, about 8 mi south of Albany.  The yard is owned by CSX Transportation and is its major classification yard for the northeast United States and the gateway to points east of the Hudson River, including New York City.  It is situated just west of the Alfred H. Smith Memorial Bridge on the railroad's Castleton Subdivision and is the eastern end of the Selkirk Subdivision.

Castleton Subdivision: The Castleton Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. state of New York.  The line runs from Schodack northwest to Selkirk along a former New York Central Railroad line.  At its southeast end, it junctions with the Berkshire Subdivision and Schodack Subdivision.  After crossing the Hudson River on the Alfred H. Smith Memorial Bridge, it meets the River Subdivision and Port Subdivision at Selkirk and ends at Selkirk Yard, where the Selkirk Subdivision begins.

Nashville Terminal Subdivision: The Nashville Terminal Subdivision is a railroad line owned by CSX Transportation in the U.S. State of Tennessee.  The Subdivision is broken up into 5 sections all in Nashville, Tennessee.  The northern part of the Terminal is in Madison, Tennessee at milepost 000/0BA 174 on the southern end of the Ex-L&N Mainline Subdivision at Monfort.  Disptach for the Mainline Sub is known as "LD" which is part of the Cincinnati Division.  From here in Madison begins the double track that stays for another 22 miles south to Brentwood, Tennessee.  At milepost 000/0BA/00H 176.6, the famous Johnny Cash "Amqui" location where the Ex-L&N Evansville, Indiana line, the Henderson Subdivision meets with the Terminal.  Dispatch for the Henderson Sub is known as "SA" and operates on AAR58.  There are two crossings near each other, Williams Ave and Nesbitt Lane at Amqui.  From here the Terminal goes south about 2 miles to the Nashville National Cemetery to the first major location, known as Ekin, 000179, where there is a cross over track from number 1 to number 2 track (left to right track).  There is also the first EDD (Defect Detector) at 000179.1.  Few more miles southward, the next major location appears.  At 000181.0, Maplewood is a major location for the Terminal.  From here the regular Terminal goes south to swap crews at Kayne Ave, and the right side, Radnor Cutoff, detours the city and gives yard departures and arrivals direct access to and from Radnor yard to cities like Louisville and Chicago.  The Cutoff runs from Maplewood to Shelby Park double track.  From Shebly the track converges into one to pass the historic Shelby bridge, then it opens back to double track.  From there, the cutoff hits the Intermediates at 0BA187.0 known as Chicken Pike.  The Radnor Cutoff carries the L&N mainline classification of "0BA" but meets the main at the same milepost from the Terminal.  At Chicken Pike, trains are staged to await arrival to Radnor yard.  Once they get clearance, speed is decreased to 15, and at 0BA188.1 the EDD (Defect Detector) sounds for departures and arrivals.  This location is known as North Radnor.  The right track diverging from the #2 is known as A-1, it is for departure trains to Chattanooga and Atlanta.  The left track which goes west from the #1 is known as A-2, and serves as a departure track to Memphis, and if the cutoff is out of service, all northbound departures.  The interesting piece of Maplewood is the crossovers that are there to move trains from the Cutoff to the Main.  Both lines remain double track for a while.  The main runs south for 2 more miles until the Intermediate signals at 000183.0.  Commonly trains will stop before Delmas Ave when Kayne Ave is at capacity and await dispatch permission before moving south.  From here, the main continues south until the CR Cumberland River Swingbridge, where the main converges into a single track shortly to cross the bridge.  At this point, trains had been running at track speed of around 40.  From the drawbridge into town, speed is reduced to around 10.  After the bridge is passed, the main returns to double track in downtown.  On the #1 track about a half a mile south, another connecting track is present.  This is the Wye track that connects the main with the Bruceton side, while rarely used for mainline trains, locals and river jobs use it.  The location is known as 8th Avenue or 8th Avenue Wye.  The main then runs down to Kayne Ave, the central hotbed of all Nashville thru traffic.  The Memphis, Tennessee Ex-L&N Bruceton Subdivision meets with the Terminal.  The Bruceton Sub begins at Church Street at 00N0.0.  The line then runs single track until 00N0.7 "11th Avenue" where it turns into double track and also meets the aforementioned, Wye track.  The Bruceton line then goes southwest a while to the next signals, at "Shops".  Now speed has been increased.  The line is still double track until "Sellars", where speed is increased to 40 and jurisdiction transferred to the SD Dispatcher.  For a short time, 4 main tracks are present and an additional fifth track for switchers and yard movements.  The tracks from left to right in Kayne Ave are as follows: 100, 99, 98, 12, 3.  The Kayne Ave yard is also here in this area, which houses some frieght and some switcher engines.  The tracks to the old shed are covered and removed.  The Union Station is not an active station, but a historic hotel.  Crew change usually occurs at the "walkway" which is under the Demombreun St bridge by the Kayne Ave Tower.  This is also where the Ex-NC&StL Chattanooga Subdivision begins.  Then tracks run south to Fogg St/South End where things get complicated.  At milepost 000/0BA/00J187 the 98 track merges into the 12 track, making for 3 tracks now.  There is a crossover from 99 to 12, also a crossover from 12 to 3.  About 2/10ths of a mile down the 99 merges into the 12 track reducing the tracks back to the regular double.  About 4/10ths of a mile down the line from Fogg St, 000187.4, Oak St, is a crossover track from #2 to #1 (the track names are no longer 3 and 12, but are back to regular names).  When trains use this crossover northbound, such as Memphis bound trains from the A-2 line, they refer to it as "Long Lead".  And now, the Terminal splits into two parts.  The right side turns into a single track shortly, and will become the Chattanooga Subdivision, and the left side runs south to Brentwood.  The right track runs single shortly until double track for a while.  This begins part of the Chattanooga Sub or J-Line.  The #2 meets with the A-2 connection track at 00J2.2 known as A-2.  Speed is now increased to 40.  Commonly northbounds will stage at 4th Ave on the #1 to await clearance.  Now about a mile down the #1 meets the A-1 connection line.  At 00J3.6 known as A-1.  Further down the double track ends at Glencliff (00J4.9).  Now it runs single for three miles until it hits Danley, which has the D Line connection track, which is an arrival track for incoming Radnor trains from the J Line.  At Danley, the Terminal ends but the same dispatcher handles traffic, "SC".  At Oak Street, our main terminal line goes south two miles to 000189.0 known as Criaghead or Vine Hill.  There is a crossover here from #1 to #2 track.  And there is also a connection/delivery track to the Nashville and Eastern Railroad which connects the Tennessee Central Railroad Museum to a major railroad.  Trains sometimes stop on the #2 before Craighead if they are waiting to enter Radnor yard.  Sometimes trains wait on the #1 at the Berry Road crossing if they await arrival to Kayne Ave. At this point, speed has been increased to 30 from 10.  Moving south, the line hits Radnor Yard at 000192.  The #2 track meets the E-Line arrival track which most Memphis trains and locals use.  The B-Line which meets the #1 track is used for departures out of the C yard and local jobs.  At Mayton, 000192.3, the B line meets the #1 track, and there is a crossover track from #2 to #1.  Speed is now at 40.  2 miles south, at 000194.0, South Radnor, the next intersection is present.  This is where the Radnor A yard meets the main.  There is a single departure/arrival track that meets the #2 track along with a crossover from #1 to #2 track.  Commonly, the #2 track south of the signals is used to halt trains.  This location is known as TVA, because of the power station that is adjacent.  From here the Terminal runs about 2.5 miles south until we hit the southern tip.  The tracks converge onto one single main, at 000/0BA196.6 known as Brentwood.  Speed is increased to 50 and jurisdiction to the S.E. dispatcher.  The right track is the main, S&NA North, while the left track is the Nashville Subdivision which runs to Columbia and exchanges freight with the TSRR.  The Nashville Terminal Subdivision is one of the busiest locations on the CSX network, and one of the most important.

Oak Point Yard: The Oak Point Yard is a freight railroad yard located in the South Bronx, New York City.  The yard is owned by CSX Transportation, and is a base for CSX's local deliveries in the area, including to the Hunts Point Cooperative Market and for trains that interchange freight with the New York and Atlantic Railway at Fresh Pond Junction in Queens.  CP Rail formerly handled some freight in and out of Oak Point, but during late 2010 entered a haulage-rights agreement with CSX under which CSX handles and forwards its local traffic between Oak Point and the Albany, New York area.  Stone-hauling trains belonging to the Providence & Worcester Railroad operate through Oak Point during trips between New Haven, Connecticut and the NY&A at Fresh Pond, but no P&W freight is actually handled in the yard.  Amtrak owns and operates two electrified tracks for the Northeast Corridor Line, on the northwest side of the yard.  CSX uses the Oak Point Link, a connecting track along the Harlem River, to travel between the yard and the Metro-North Hudson Line, which is its primary access route into New York, while the P&W stone trains enter via the Northeast Corridor line to the northeast.  CSX and P&W trains to Fresh Pond cross the Hell Gate Bridge onto Long Island.

Supporting paragraphs: Selkirk Yard Hudson River
Answer: The Hudson River