Does Stadler make the FLIRT in and 8 or 9 car configuration? Most Northeast Regionals are at least 8 cars long, and maybe they should even be longer (or be able to be made longer) to increase capacity. Based on the examples we rode in Texas at the Gathering, the design seems to be more like an upgraded light rail car, which provides level boarding at low platforms. I'm not sure how the design would be modified for the high platforms of the NEC.The best choice for Amtrak in this situation is going to be EDMUs (Amtrak needs to also solve the engine switch problem). There will ultimately be two contenders (Stadler and Hitachi Rail), though I think Hitachi's A-Train might win out over Stadler's FLIRT because the A-Train is not articulated (makes maintenancr easier). Perhaps this design would be called the Cityliner.
Of course this would supplant many ACS-64s but they can find new life with MBTA and SEPTA