Question: What two cities are home to the port of entry situated at the north end of the Port Subdivision railroad line?

Context articles: Nashville Terminal Subdivision
Port of Albany–Rensselaer
Thomasville Subdivision
Niagara Subdivision
Tampa Terminal Subdivision
Sarnia Subdivision
Framingham Secondary
Castleton Subdivision
Port Subdivision
St. Lawrence 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.
The Port of Albany–Rensselaer, widely known as the Port of Albany, is a port of entry in the United States with facilities on both sides of the Hudson River in Albany and Rensselaer, New York.
 Private and public port facilities have existed in both cities since the 17th century, with an increase in shipping after the Albany Basin and Erie Canal were built with public funds in 1825.
The Thomasville Subdivision is a railroad line owned by CSX Transportation in the U.S. State of Georgia.
 The line runs from Thomasville, Georgia to Waycross, Georgia for a total of 106.3 miles.
 At its north end it continues south from the Thomasville Yard and at its south end it continues south as the Fitzgerald Subdivision and Jesup Subdivision.
 There is also the Waycross Terminal section of the Thomasville Subdivision which runs in the Waycross, Georgia area and is 7.1 miles in length.
 At its north end it branches off of the Thomasville Subdivision and at its south end it connects with the Jesup Subdivision.
The Niagara Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. state of New York.
 The line runs from Buffalo north and west to Niagara Falls along a former New York Central Railroad line.
 Its south end is at the Buffalo Terminal Subdivision; its north end is near the Canada–US border at the Whirlpool Bridge.
 It junctions the Belt Subdivision in Buffalo and the Lockport Subdivision east of Niagara Falls.
The Tampa Terminal Subdivision is a railroad line owned by CSX Transportation in the U.S. State of Florida.
 There are 3 sections to the Tampa Terminal Subdivision.
 The first section runs from Control Point (CP)-YN to Gary, Florida and is 4 mi in length.
 At its north end it continues south from the Yeoman Subdivision and at its south end the west main leads to the Clearwater Subdivision while the east main leads to the Hooker's Point Lead.
 The second section runs from Mango, Florida to Tampa, Florida and is 8.1 miles in length.
 At its north end it continues south from the Lakeland Subdivision and at its south end it continues south as the Port Tampa Spur.
 The third section runs from Control Point (CP)-YN to East Tampa, Florida and is 7.3 miles in length.
 At its north end it continues south from the Yeoman Subdivision and at its south end it continues south as the Palmetto Subdivision.
The Sarnia Subdivision is a railroad line owned by the Lake Erie and Detroit River Railway and operated by CSX Transportation in the Canadian province of Ontario.
 The line runs from Chatham north to Sarnia along a former Pere Marquette Railway line.
 From its north end, CSX has trackage rights west over the Canadian National Railway's Strathroy Subdivision (through the St. Clair Tunnel) and the Grand Trunk Western Railroad's Flint Subdivision to the CSX Port Huron Subdivision near Port Huron, Michigan and the Saginaw Subdivision in Flint.
The Framingham Secondary (formerly the Framingham Subdivision) is a railroad line in the U.S. state of Massachusetts.
 The line runs from Mansfield northwest to Framingham along a former New York, New Haven and Hartford Railroad line.
 Its south end is at Amtrak's Northeast Corridor, over which CSX has trackage rights to reach the Middleboro Subdivision at Attleboro and the Boston Subdivision in Boston (via the Fairmount Line).
 Its north end is at the Framingham/Worcester Line; the Fitchburg Subdivision continues northwest from Framingham.
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.
The Port Subdivision is a railroad line owned by CSX Transportation in the U.S. state of New York.
 The line runs from Selkirk north to Albany along a former New York Central Railroad line.
 At its south end, the Port Subdivision junctions with the Castleton Subdivision and River Subdivision; its north end is at the Port of Albany, served by the Albany Port Railroad.
The St. Lawrence Subdivision is a railroad line owned by CSX Transportation in the U.S. state of New York.
 The line runs from Syracuse, NY north to Massena (village), New York along a former New York Central Railroad line.
 At its south end, it meets the Syracuse Terminal Subdivision; its north end is at the south end of the Montreal Subdivision.
 Along the way it junctions with the Fulton Subdivision at Woodard, New York (near Liverpool).