Gallatin Street Speed Improvement Design-Build Project

Gallatin Street

Gallatin Street Speed Improvement Design-Build Project

In July of 2012, as part of the second phase, Kansas City Southern (KCS) issued a Design-Build Request for Proposal (RFP) for the Gallatin Street Speed Improvement Project. The existing alignment included 16-degree curves and restricts operating speeds of trains to 10 mph or less through the project area. The goal was to increase the operating speed of trains within a portion of the Meridian Speedway to 30 mph along both the mainline and the siding.

HDR | ICA teamed with the construction firm Austin Bridge & Road, (ABR) to provide design-build services to compete for the project and deliver an innovative solution. KCS had a preliminary design which pushed for a new location of the mainline and required two new bridges: one over Gallatin Street and the other over Town Creek. The siding would utilize the existing bridges over Town Creek and Gallatin Street.

With the conditions and challenges in mind, the Austin Bridge & Road/HDR | ICA Team started to investigate innovative options that would reduce construction costs while still being responsive to the RFP.

As a result of this effort, we proposed a tighter track alignment and to widen the existing bridge opposed to constructing two new bridges. We shifted the alignment slightly eastward to avoid any impact to the existing box culvert and Town Creek. This also allowed for both tracks to tie to the existing rail prior to the existing Town Creek Bridge crossing. The tighter alignment also meant fewer embankments would be required to build up the new track bed. We presented this concept to the team and it quickly became the focus of our proposal design.

The Result

  • An eight-degree curvature will allow rail traffic to operate at 30 mph.
  • We maintained rail traffic, averaging 25 trains a day, on the existing siding alignment during construction of the bridge and mainline track. Once complete, traffic was shifted to the new mainline track to construct the new siding.
  • Traffic was sustained on Gallatin Street completely during the work week.
  • There was minimal disturbance to existing utilities both above and below ground.
  • A significant reduction in construction costs was provided.
  • The minimum lateral clearance between KCS and CN centerlines was increased from 19 feet to 25 feet.
  • A beautiful and historic structure was provided by including key design features of the existing bridge to the widened portion.
Gallatin Street
Kansas City Southern

Jackson, Hinds County, MS
United States