Question: What trail did the trail, of which Potter-Blocker was a collateral branch, replace?

Context paragraphs:
Prince Kachō Hiroatsu: Prince Kachō Hiroatsu (華頂宮博厚親王 , Kachō no miya Hiroatsu Shinnō , 18 January 1875 – 15 February 1883) of Japan, was the second head of the Kachō-no-miya collateral branch of the Japanese imperial family.

Metropolitan Branch Trail: The Metropolitan Branch Trail, also called the Met Branch Trail, is an 8 mi planned rail trail will run from the Silver Spring, Maryland Transit Center to Union Station in the District of Columbia.  It serves to extend the Capital Crescent Trail where it merges with the active WMATA/CSX railroad into the National Capital.  At Fort Totten a connector trail to the Northwest Branch Trail of the Anacostia Tributary Trail System at Hyattsville, Maryland will be constructed; and an on-street connection to the National Mall will be constructed from Union Station.  When completed, the Metropolitan Branch Trail will serve as part of the East Coast Greenway.

Prince Kachō Hirotsune: Prince Kachō Hirotsune (華頂宮博経親王 , Kachō no miya Hirotsune Shinnō , 19 April 1851 – 24 May 1876) of Japan, was the founder of a collateral branch of the Japanese imperial family.

Potter-Blocker Trail: The Potter-Blocker Trail (sometimes called the Potter-Bacon Cutoff), and also just the potter-bacon trail was a trail blazed by Jack Potter used to move cattle to market, starting around 1883.  It was a collateral branch of the Great Western Cattle Trail, but was shorter and crossed more unforgiving land.  The trail went at least from Hebbronville, Texas up to Albany, TX, intersecting the Western Trail at Alice, Texas.

Prince Kachō Hirotada: Prince Kachō Hirotada (華頂宮博忠王 , Kachō-no-miya Hirotada-ō , 26 January 1902 – 24 March 1924) of Japan, was a member of a collateral branch of the Japanese imperial family.

Mikeladze: Mikeladze (Georgian: მიქელაძე ) was a Georgian noble family, known from at least the 14th century.  The senior, and the princely, line of the Mikeladze flourished in Imereti (western Georgia), while a collateral branch was later established as the petite nobles Mikelashvili (მიქელაშვილი) in Kartli (central Georgia).

Kachō Hironobu: Marquis Kachō Hironobu (華頂博信 , Kachō Hironobu , May 22, 1905 – October 23, 1970) , was a descendent of the Fushimi-no-miya collateral branch of the Japanese imperial family.

Gwynns Falls Trail: Gywnns Falls Trail is a 15 mi series of hiking and bicycling trails inside Baltimore, Maryland, named for the Gwynns Falls, whose course it follows, and the surrounding Gwynns Falls Leakin Park it passes through.  The trail uses unique alignments, sidepaths on existing streets, and on-street sections.  The trail consists of one 10.75 mi mainline, plus a number of branches, including the Middle Branch Trail, the Hutton Trail, and the Dickeyville Trail.  All of these trails carry signage designating them as the Gwynns Falls Trail; their individual names are designated via pavement markers designating their route.  The entirety of the Middle Branch Trail, as well as the section of the mainline trail east of the Middle Branch Trail's northern terminus, are part of the East Coast Greenway.

Prince Yasuhiko Asaka: General Prince Yasuhiko Asaka (朝香宮鳩彦王 , Asaka-no-miya Yasuhiko-ō , 20 October 1887 – 13 April 1981) of Japan was the founder of a collateral branch of the Japanese imperial family and a career officer in the Imperial Japanese Army.  Son-in-law of Emperor Meiji and uncle by marriage of Emperor Hirohito, Prince Asaka was commander of Japanese forces in the final assault on Nanjing, then the capital city of Nationalist China, in December 1937.  He was a perpetrator of the Nanking massacre in 1937 but was never charged.

Great Western Cattle Trail: The Great Western Cattle Trail was used during the 19th century for movement of cattle and horses to markets in eastern and northern states.  The trail was also known as the Western Trail, Fort Griffin Trail, Dodge City Trail, Northern Trail and Texas Trail.  It replaced the Chisholm trail when it closed.  While it wasn't as well known, it was greater in length, reaching rail-heads up in Kansas and Nebraska and carried longhorns and horses to stock open-range ranches in the Dakotas, Wyoming, Montana, and two provinces in Canada.

Supporting paragraphs: Potter-Blocker Trail Great Western Cattle Trail
Answer: Chisholm trail