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Yard: A system of auxiliary tracks used exclusively for the classification of passenger or freight cars according to commodity or destination; assembling of cars for train movement; storage of cars; or repair of equipment. (49CFR223)

Yard: A system of tracks within defined limits, whether or not part of a terminal, designed for switching services, over which movements not authorized by time table or by train order may be made, subject to prescribed signals, rules and requirements. (AAR1)

Yard Caboose: A caboose that is used exclusively in a single yard area. (49CFR223)

Yard Crew: See Train or Yard Crew.

Yard Locomotive: A locomotive that is operated only to perform switching functions within a single yard area. (49CFR223)

Yard Mule: Small tractor used to move semitrailers around the terminal yard. (ATA1)

Yard Switching Train Mile: Computed at the rate of 6 mph for the time actually engaged in yard switching service if actual mileage is not known. (FRA2)

Yard Switching Trains: Those trains operated primarily within yards for the purpose of switching other equipment. Examples include the making up or breaking up of trains, service industrial tracks within yard limits, storing or classifying cars, and other similar operations. Switching performed by a road crew that is incidental to the road operation is not included. (FRA2)

Yard Track: A system of tracks within defined limits used for the making up or breaking up of trains, for the storing of cars, and for other related purposes, over which movements not authorized by timetable, or by train order may be made subject to prescribed signals, rules or other special instructions. Sidings used exclusively as passing track and main line track within yard limits are not included in the term yard track. (49CFR245) (FRA2)

Yard Tractor: A truck tractor used exclusively to move trailers around a motor or trailer yard. It is not used for over the road travel. (BOC3)

Yardbird: (See also Spotter) A driver who connects and disconnects tractor and semitrailer combinations and moves vehicles around the terminal yard. (ATA1)

Yawl: (See also Skiff) A small oar-propelled open boat or skiff carried aboard a towboat for use as a utility boat. (TNDOT1)

Yawl Play: The use of a yawl to row lines or personnel between boat and bank. (TNDOT1)

Year of Construction: The year the structure was originally completed or the year any part of the structure was first occupied. For mobile homes year of construction is the model year. (DOE5)

Year of Construction of Vessel: Year of original construction of the hull. (TNDOT1)