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Trail making test
The trail making test is a timed paper-and-pencil neuropsychological test in which subjects connect numbered and lettered circles, the third most widely used test in neuropsychology.
Trail mix
Trail mix (also gorp, scroggin, or Studentenfutter) is a portable snack mix of dried fruit, nuts, and often chocolate or granola for hikers; the earliest dated American recipe appears in Horace Kephart's 1906 camping guide.
Trail of Flowers
Trail of Flowers is Sierra Ferrell's second studio album, released March 22, 2024 on Rounder Records; 12 songs, 37 minutes, produced by Eddie Spear and Gary Paczosa, winner of the 2024 Americana Album of the Year and 2025 Grammy for Best Americana Album.
Trail of Tears
The Trail of Tears, called Nunna daul Isunyi in Cherokee, was the forced 1830s and 1840s removal of Native American nations from the southeastern United States to Indian Territory.
Trail of the Pink Panther
Trail of the Pink Panther (1982), Blake Edwards comedy assembled after Peter Sellers's death from unused Clouseau footage, with Joanna Lumley as reporter Marie Jouvet investigating the inspector's disappearance.
Trail orienteering
Trail orienteering (TrailO), an IOF orienteering discipline testing map-reading from accessible trails: PreO, TempO, PreO sprint formats; Open, Junior, and P classes; WTOC in odd years; majority of competitors able-bodied.
Trail Ridge Road
Trail Ridge Road: highest continuous paved road in the United States, a 48-mile route through Rocky Mountain National Park connecting Estes Park and Grand Lake, cresting at 12,183 feet, built 1929-1938.
Trail running
Trail running: off-road running on natural terrain (max 20% paved, ITRA definition), governed by World Athletics/ITRA/WMRA, 20+ million participants, championship formats 35-85 km, distinct from mountain running, fell running and skyrunning.
Trail Smelter dispute
The Trail Smelter dispute was a Canada-US transboundary pollution arbitration (awards 1938 and 1941) over sulphur dioxide from the Consolidated Mining and Smelting Company smelter at Trail, British Columbia, damaging Washington farmland; its no-harm dictum founded international environmental law.
Trailblazer (Honkai: Star Rail)
Trailblazer (Caelus or Stelle) is the playable main protagonist of Honkai: Star Rail, HoYoverse's 2023 turn-based RPG. Awakens without memory, joins the Astral Express, and uniquely switches Paths and elements: Destruction, Preservation, Harmony, Remembrance.
Trailblazer Gas Pipeline
The Trailblazer Gas Pipeline is a 793-mile natural gas line from Whitney Canyon, Wyoming, to Beatrice, Nebraska, completed in 1982 and later converted to carbon dioxide service.
Trailer (promotion)
Trailer (promotion): the short audiovisual advertisement for a forthcoming film, also called a movie preview. Originated 1913 with Nils Granlund at Loew's; dominated by National Screen Service until the 1960s; capped at two minutes since 2014.
Trailer (vehicle)
A trailer is an unpowered vehicle drawn by a powered vehicle, carrying freight, animals, or equipment, with its wheels bearing some or all of the load.
Trailer park
A trailer park is a residential development where factory-built houses occupy leased plots, serving as the largest source of unsubsidized affordable housing in the United States.
Trailer Park Boys
Trailer Park Boys: Canadian mockumentary comedy series created by Mike Clattenburg about Ricky, Julian and Bubbles in fictional Sunnyvale Trailer Park, Nova Scotia; Showcase 2001–2008, Netflix revival to 2018, films and spin-offs.
Trailer Park Boys: Jail
Trailer Park Boys: Jail, a SwearNet spin-off of Trailer Park Boys, follows Ricky, Julian, and Bubbles in prison; two seasons (2021, 2025), 18 episodes, ended, now on TPB+.
Trailer-on-flatcar
Trailer-on-flatcar, or TOFC, popularly called piggyback, is a rail intermodal method that carries intact highway trailers on flatcars; the first regular service ran in 1926 between Chicago and Milwaukee.
Trailing suction hopper dredger
A trailing suction hopper dredger (TSHD) is a self-propelled ship that trails suction arms along the seabed and pumps sediment into an onboard hopper for transport.
Traill Ø
Traill Ø (Traill Island) is an uninhabited 3600 km² East Greenland island between Vega Sund and Kong Oscar Fjord, named by Scoresby in 1822 for Thomas Stewart Traill, later a Norwegian-Danish hunting ground and geological type area.
Trails (series)
Trails (Kiseki series, sold as The Legend of Heroes) is Nihon Falcom's story RPG franchise set on Zemuria, begun in 2004 with Trails in the Sky; 13 English mainline games across Liberl, Crossbell, Erebonia, and Calvard arcs share one continuous plot.
Trailways Transportation System
Trailways Transportation System is a North American association of independently owned motorcoach companies founded in 1936 as the National Trailways Bus System to compete with Greyhound.
Train (band)
Train is an American pop rock band formed in San Francisco (1993 or 1994), fronted by Pat Monahan. Known for "Meet Virginia," "Drops of Jupiter" (2002 Best Rock Song Grammy), and "Hey, Soul Sister," it has released 11 studio albums.
Train communication network
A train communication network (TCN) is a data communication network connecting programmable electronic equipment on board rail vehicles, standardized in the IEC 61375 series and carrying the train control and monitoring system.
Train Dreams (film)
Train Dreams (2025 film), directed by Clint Bentley from Denis Johnson's novella, stars Joel Edgerton as logger Robert Grainier in the early 20th-century Pacific Northwest; Netflix release, four Oscar nominations, three Independent Spirit Award wins.
Train horn
A train horn, also called a railroad horn, is a compressed-air horn or steam whistle on a locomotive that warns people of an approaching train.
Train of Thought (Dream Theater album)
Train of Thought (2003) is Dream Theater's seventh studio album, its heaviest, written in three weeks, mixed by Kevin Shirley, with As I Am, Stream of Consciousness, and In the Name of God.
Train on the Island
Train on the Island: Aldous Harding's fifth studio album (4AD, May 8, 2026), co-produced by John Parish at Rockfield Studios, Wales; also the title of a traditional American old-time song (Roud 17376) recorded since 1927.
Train operating company
A train operating company (TOC) runs passenger or freight train services on a railway network, a term used most specifically in Great Britain since privatization in the mid-1990s.
Train Order Operation
Train order operation is a rail dispatching method in which a dispatcher authorizes train movements by written orders supplementing a timetable, used in North America from 1851 into the 1980s.
Train Park Hakusan
Train Park Hakusan (トレインパーク白山), formally Hakusan Municipal High Speed Rail Visitor Center, is a Shinkansen museum in Hakusan, Ishikawa, opened March 13, 2024 beside the Hakusan General Rolling Stock Depot, with simulators, a Doctor Yellow 0 Series T3 exhibit, and depot viewing decks.