Highline Bridge (Kansas City, Kansas)

Construction of the bridge and several miles of associated viaducts largely on the northwest side of river cost $3M and was part of $4.5M (approximately $100M adjusted for inflation to 2022) in total improvements needed for the terminal relocation project. The construction of the Highline Bridge was delayed several years beyond the 1914 opening of the new union station due to disagreement on route of the viaducts and location of stations serving Kansas City, Kansas.[4][5]

The current bridge replaced a 730-foot single-track bridge built in 1907 that consisted of two 300-foot Petit truss spans and a 130-foot approach on the west side. The piers of the old bridge had been constructed to accommodate double track and were reused. Since the old bridge carried approximately 180 train movements per day across the river it could not be removed from operation to accommodate construction. Due to the new bridge's greater height and width, it was constructed around the old bridge while it remained in service, although the existing tracks were centered and elevated so the new bridge floor could be constructed under it.

The current bridge consists of two reinforced Baltimore truss sections built on the original masonry (each weigh 2,300 tons), extended to accommodate the double-deck height, while the west approach was rebuilt as a 132-foot Warren truss such that the bridge is a through structure for the lower deck and a deck structure for the top deck.

All three truss sections that cross the river between the levees have lift jacks to raise the bridge above a high flood.[1]

Construction work was under the direction of J. V. Hanna, chief engineer, and G. E. Tebbetts, bridge engineer of the Kansas City Terminal. The general contractor for the entire project was the Arkansas Bridge Company of Kansas City, MO. The steel work was fabricated by the American Bridge Company at the Gary, IN plant, and was erected by the Kelly Atkinson Construction Company, Chicago, IL.

At ground level, below the Highline, is a complex network of tracks that the KTCR refers to as the "low line".[6] The immediate low line approach to the southeast end of the bridge is a full grand union,[7] with a three-quarter union immediately to the southeast and, originally, a butterfly union immediately to the northeast.[8]

Santa Fe Junction (previously A.T.&S.F. Junction) has been a name for the general location of the main grand union. The name is derived from the original KTCR name for the southwest junction of the main union; and that name appears on the Tower No. 3 (interlocking control tower) at that location. That junction was the KCTR's original connection to Santa Fe's property a short distance from the ATSF Argentine classification yard. The location is also, if less commonly, referred to as Chicago Junction from the KCTR name for the opposing northeast junction.[7][9] Originally, the Chicago Junction was the KCTR's connection to the nearby Chicago, Burlington and Quincy yard.[3][8] That yard and butterfly union were later removed, but the name was retained.[6]

Currently nearly all the trackage to the northwest of the bridge is under control of the Union Pacific, although the KCTR also owns and operates trackage and a yard as well. The bridge provides a connection for UP traffic on the KCTR to reach the extensive UP Armourdale classification yard, as well as connections to UP lines to the west (Kansas Subdivision) and northwest (Falls City Subdivision). On the east end, the upper level of the bridge continues to near the Kansas City Union station, while the lower level has connections with additional KCTR trackage and BNSF lines at Santa Fe Junction. This allows access to the BNSF Argentine classification yard as well as the Fort Scott and Emporia Subdivisions to the south and west respectively.

In 2004, the KCTR Argentine Connection flyover was completed to carry BNSF Southern Transcon traffic via a third level.[10]

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