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Non-vital advance rail preemption of signalized intersections near highway-rail grade crossings

Description: The Texas Department of Transportation (TxDOT) primarily uses simultaneous preemption of traffic signals near highway-rail grade crossings to clear queued vehicles prior to the arrival of a train at the crossing. At some intersections, 20 seconds of advanced warning may not be sufficient to allow the traffic signal to clear pedestrians using the normal clearance intervals between phases. The research developed an alternative method (non-vital advance preemption) of ensuring adequate pedestrian clearance in the presence of an approaching train without interfering with the normal preemption sequence at the intersection or installing costly additional track circuitry needed to provide advance preemption. Two strategies were investigated to ensure pedestrian clearance time. The first utilizes a lower-level preemption sequence to guarantee full pedestrian clearance to a terminating phase before the traffic signal starts the preemption sequence. The second strategy uses the pedestrian-omit feature to prevent the controller from activating the pedestrian interval if there is not sufficient time in advance of the start of the preemption sequence to provide full pedestrian clearance.
Date: June 2007
Creator: Balke, Kevin N.; Engelbrecht, Roelof Johannes & Ruback, Leonard G.
Partner: UNT Libraries Government Documents Department

Railroad-Gate.

Description: Patent for certain new and useful improvements in railroad gates, including instructions and illustrations.
Date: December 13, 1898
Creator: Cottle, Thomas M.
Partner: UNT Libraries Government Documents Department

[The Train That Brought FDR to Childress, Texas]

Description: Photograph of a steam engine traveling across an open field. There are parked cars waiting along both sides of the train tracks and the drivers are waiting outside their cars. President Franklin D. Roosevelt is a passenger on the train according to the handwriting on the edge of the photograph.
Date: 1938
Creator: Stanford Studio
Partner: Childress County Heritage Museum

Railway-Crossing Signal

Description: Patent for improvements in Railway-Crossing Signals that provide both a visual and audible signal to be given at the crossing when a train is approaching.
Date: August 25, 1914
Creator: Adleta, William P.
Partner: UNT Libraries Government Documents Department

Railway-Crossing.

Description: Patent for a railway crossing track, which does not jar the train's wheels as it passes over the crossing.
Date: November 17, 1908
Creator: Adams, Powell O.
Partner: UNT Libraries Government Documents Department

Railway-Crossing.

Description: Patent for a railway crossing, which provides track treads for trains at heavily used crossings.
Date: June 21, 1910
Creator: Gallaspy, Benjamin E. & McCarty, Alexander H.
Partner: UNT Libraries Government Documents Department

Railway-Crossing.

Description: Patent for a railway crossing, which is simpler to build and maintain and more durable than previous railway crossing connections.
Date: January 21, 1908
Creator: Hosmer, Arthur
Partner: UNT Libraries Government Documents Department

Railroad Crossing

Description: Patent for a railroad crossing. Illustration included.
Date: November 13, 1906
Creator: Baker, Horace A.; Crowson, J. J. & Crowson, Richard B.
Partner: UNT Libraries Government Documents Department

Railroad-Crossing.

Description: Patent for a railroad crossing that has tracks, which make less noise when it is crossed by a train than previous models.
Date: April 25, 1911
Creator: Blankinship, William Asbury & Copeland, William
Partner: UNT Libraries Government Documents Department

Railroad-Crossing.

Description: Patent for a railroad crossing that "consists in certain devices organized in a manner to secure automatic alignment of a series of movable rail-sections with the main rails of a track on which a train is traveling in the direction of the crossing, the approach of the train setting in motion the devices by which the rail-sections are controlled, and thus dispensing with an attendant at the crossing to set the contrivance for the safe passage of the train through the crossing" (lines 12-22).
Date: October 11, 1892
Creator: Knight, Mosses G.
Partner: UNT Libraries Government Documents Department

Gate.

Description: Patent for an automatic gate at railroad crossings, adaptable for use in "farm gates and automatic gates for carriage roads" (page 1, lines 11-12) using "an inclined cam disk, of a spring actuated lever" (page 4, lines 27-28), trip devices, and a bell or other signal, with illustrations.
Date: January 24, 1893
Creator: Neeb, William
Partner: UNT Libraries Government Documents Department