Mass Transit

SEP-OCT 2014

Mass Transit magazine features agency profiles, industry trends, management tips and new product information.

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68 | Mass Transit | MassTransitmag.com | SEPTEMBER/OCTOBER 2014 Partnering with purpose AECOM partners with our clients to offer fresh, innovative and state-of-the-art transit solutions. Our vision is to create more livable neighborhoods and thriving business communities. Visit us at booth no. 1537. www.aecom.com Photo credit: Metropolitan Transportation Authority / Patrick Cashin. For more information, visit www.MassTransitmag.com/10066051 Challenge 1: Spanning the Agua Hedionda Lagoon Projects of this scale and magnitude face a multitude of complex engineering chal- lenges. At Carlsbad, the major challenge is spanning water, specifcally the Agua Hedionda Lagoon. Te Carlsbad Double Track and Bridge Project is not the frst to span the Agua Hedionda Lagoon. • 1881: Te frst railroad bridge across the lagoon is the California Southern Railway, a subsidiary of Atchison, To- peka & Santa Fe (AT&SF;) Railway. Te bridge is a classic trestle, a series of short spans across a number of supports, and refects the early trend of railroading. Te trestle has 14 spans with a ballast- ed deck, where the rail track fastens di- rectly to ties on the spans. Te trestle support posts are pile-driven into the ground. In short, the bridge is a 14-span open-deck pile trestle bridge. • 1948: AT&SF; feld records indicate a third timber trestle in a new alignment. • 1958: Te city of Carlsbad adds a 12- inch sanitary sewer timber pile trestle bridge across the creek adjacent to the timber trestle on the inland side. • 2006: North County Transit District (NCTD) builds a three-span concrete bridge on a new alignment west of the 1948 timber trestle, meant to replace the trestle. Tey demolish the timber trestle to accommodate a future second main track or "double track." • 2009: Amtrak issues a design contract for the Carlsbad Double Track and Bridge Project. • 2010: Amtrak issues a construction con- tract for the Carlsbad Double Track and Bridge Project. A CREW sets ups an Oscillator DOUBLES DOWN

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