jdamelio–
While a high platform will certainly help you at PHL, you must remember that it will not clear a freight car, so installation of high platforms out in the hinterlands, particularly on joint freight lines (single or double track) would require installation of a cost-prohibitive gantlet track on the active platform track(s) so that the freights can be shunted off to the side away from the platform for clearance. This track must be longer than the platform and would require power switches and interlocking, for a cost (nominal 1000’ platform) of about $600-800K per track, or more. And there are other issues. For instance, here in TX such a high platform cannot be built legally except on a dedicated passenger station track; construction on a joint freight track violates the Texas Clearance Law. Technically, we have trouble with even 8" TOR platforms, but some in that range may have accidentally occurred.
And, above Orlando (in your area) that high level platform like at PHL would not work with the Superliners on 1&2. Nor would it work south of West Palm, because it blocks the doors on the TriRail bilevels.
Please excuse my ignorance but I honestly don’t quite understand how a high level platform doesn’t meet freight car clearances. Are freight cars wider than passenger cars?