F-Line to Dudley
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Hey F-Line, I know this is beating a dead horse, but I figure you can provide the answer quickest (and my apologies if you did so recently).
Could a CR station fit on the bridge itself, in theory?
No. For same reason as it not being able to fit near the casino coming off the bridge, the track incline on the bridge itself is too steep for an ADA platform. You're only allowed a maximum 2% gradient on a platform to stay within ADA compliance. The bridge is a 3% grade (a couple tenths of percent steeper still on one side, but can't remember if that's Everett or Somerville). Not only is it too steep, but you can't ugly-hack it by giving the platform a lower grade than the track because it'll make the platform edges askew with the doors and violate the ADA a different way by breaking level boarding.
You won't even get issued a permit to spraypaint the first dig spot with such a large discrepancy vs. federal law. There's only 2 other spots on commuter rail with ADA-violating grades: Wellington tunnel approaches on Haverhill/Reading (3.5%), and the Neponset River Bridge on the Old Colony (3%). The Old Colony duck-under of the Red Line in East Braintree comes close at 2% on-the-button. Everywhere else it's less than that, so this is a very rare occurrence overall that just so happens to unfortunately occur right in front of Encore.