Mass Transit

SEP-OCT 2014

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

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SEPTEMBER/OCTOBER 2014 | MassTransitmag.com | Mass Transit | 73 A friendly voice for your customers toll free 888.561.8747 www.mtm-inc.net From call intake and trip scheduling to dispatching services, MTM's call center solutions are efcient and driven by industry-leading technology. Every year, our staf processes three million calls while maintaining high satisfaction rates and exceeding expectations through high quality customer service. Let MTM be your voice. Call Center Services For more information, visit www.MassTransitmag.com/10982508 so. From history, he knows that the drilling method, even with ground modifca- tions, does not work. From the geotechnical evaluation, he knows that the driving, boring and vibrating methods would not work because they cause high water table and the risk of more soil liquefaction. Te designer, through process of elimination, decides to use the oscillating method. For added stability and strength, the designer uses cast-in-steel-shell (CISS) piles instead of CIDH piles. CISS piles are steel tubes flled with concrete. Each intermediate pier uses two larger diameter CISS piles, while each abut- ment uses two smaller diame- ter CISS piles. To stabilize the earth, the designer uses auger cast concrete piles, installed seven days before the CISS steel tubes. Te tube instal- lation process does not cause or encounter any signifcant ground movement or soil liq- uefaction. A concrete pump truck flls all of the CISS steel tubes with concrete. During pile installation, temporary sheet shoring pro- tects the 2006 concrete bridge and track from collapse and other disruptions. Te protec- tive measure allows the train service to continue amid con- struction of the new intermedi- ate piers and abutments. Two cranes, at either end of the bridge, set the rede- signed girders onto the new intermediate piers and abut- ments. The bridge deck (the top edges of the redesigned girders) is waterproofed and f looded with ballast materi- al. The train track fastens to the ballast ties. Challenge 2: Maintaining Existing Train Service Te design of the train track itself is an ordinary fare. Te challenge is developing a new track alignment while maintaining existing train service. Te alignment would need to accommodate a sec- ond main track, a second main bridge and a universal crossover control point that allows trains to switch tracks when they're traveling in ei- ther direction. The universal crossover does not make use of the ex- isting turnout or switch, re- lying instead on four newly installed turnouts. The train service could continue on the existing turnout. Te railroad at Carlsbad operates according to the General Code of Operating Rules (GCOR), a compila- tion of operating rules for some railroads in the U.S. Te GCOR allow crew to perform track work that passing trains would other- wise disrupt, as long as cer- tain conditions are met. Te Carlsbad Double Track and Bridge Project secures Form LONG BALLASTS stretch over a lagoon.

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