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Middletown Railroad Bridge Replacements

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Amtrak faces a monumental challenge in maintaining its infrastructure between Philadelphia and Harrisburg. This was never more evident than in Middletown, Pennsylvania where two vital bridges had begun to deteriorate. It was determined that the bridges needed to be replaced; however, the rail traffic could not be interrupted for a significant amount of time.

Modjeski and Masters provided design and construction consultation services for Bridge No. PA 94.98 over Wood Street and Bridge No. PA 97.74 over Union Street. The 3-span structures were designed for replacement on the same alignment using self-propelled modular transporters, or SPMT’s. Each replacement structure was erected at nearby staging areas in preparation for replacement operations – scheduled to take place over one weekend to minimize both track outage time for Amtrak and service disruptions to their passengers. M&M provided construction assistance on the precise roll-in / roll-out bridge maneuvers. 

For more information, see our project documentary film on YouTube

Bridge Geometry
Union Street
Length of Main Span 54 Feet
Total Project Length 79 Feet
Tracks on Structure Four Tracks
Wood Street
Length of Main Span 38 Feet
Total Project Length 64 Feet
Tracks on Structure Four Tracks

[M&M] knows [Amtrak’s] operations; they work well with our Engineering Group in Philadelphia. [Amtrak has] a good rapport with them. [M&M is] a flexible consultant; they bring in innovative ideas and solutions to the various projects and problems that we have on the railroad.

-John Brun, PE, Director of Structural Design