Justification for Separate Amtrak and Authority Waivers
Amtrak and the Authority require two sets of two prototypes to be designed, assembled and tested under the Amtrak trainset procurement contract. The Amtrak and Authority trainsets will share a common platform. There are, however, physical and technological differences between the two, driven by the particular needs of Amtrak and the Authority. The Amtrak trainset will be designed and constructed to conform to the Amtrak NEC clearance requirements. This will impact the overall width of the trainset and the lower comer of the trainset where clearance between the equipment and the third rail is needed thereby requiring modifications to existing train set designs (e.g., carbody width and underfloor equipment layout). With new infrastructure, the Authority is not limited to the constraints found on the NEC and has the flexibility to leverage several existing equipment designs. Because of these physical differences, it is likely that manufacturers will propose two different trainset carbodies.
From a technological perspective, the Amtrak and Authority trainsets differ in initial operating speed, electrification, braking, signal/control and radio system, and suspension requirements:
• The Authority's trainset will have the capability of operating up to 220 mph, with testing speeds up to 242 mph. Amtrak is initially specifYing an operating speed of 160 mph, with testing speeds up to 165 mph.
• The Authority's trainsets will be required to operate on extended gradients and in extended tunnels on the gradients as the alignment traverses the Diablo, Tehachapi and San Gabrielle mountain ranges. This will impact the design of the traction, braking and cooling systems.
• The Authority's traction power system will be based on a 25 kV, 60Hz system, whereas Amtrak's NEC operates with three different voltages, 12 kV, 25Hz; 12.5 kV, 60Hz; and 25 kV, 60Hz. The Amtrak trainset propulsion package will be a significantly different design when compared to the Authority's trainset, and the Authority anticipates that there will be two separate and distinct trainset propulsion system designs.
• The Authority's braking requirements will be based on criteria defined in European Technical Specifications for Interoperability, whereas Amtrak will need to meet the stop distances currently found on the NEC. There is likely to be differences in the type/number of brake equipment installed on the respective trainsets, especially considering the extended gradients found on the Authority alignment.
• Amtrak requires signaling equipment for Automatic Train Control and Positive Train Control compatible with the existing NEC infrastructure, whereas the Authority is initially specifying interface points (for both signaling and radio) that will be resolved once a systems Contractor is determined.
Based on the aforementioned differences, two distinct sets of prototypes are warranted.