F-Line to Dudley
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Curves make that hard. While the B&A doesn't have many sharp curves in MBTA territory it does wave around almost constantly throughout MetroWest meaning even the express trains are going to be in curve restriction recovery time a large percentage of the time. Most of the travel-time savings that the T envisions from the tri-track project are from stripping out copious excess schedule padding (i.e. shorter level-boarding dwells, and way more dispatching precision with the new track layout), not from raw speed increases. Some curves on freight-free Boston-Framingham could *possibly* be treated with more superelevation, but that's unlikely to net more than seconds of cumulative time to an Amtrak or H2H so is unlikely to be worth the cost. More superelevation is definitely not in the cards Framingham-west because of all the freight tonnage that's getting its max speeds increased to 60 MPH per the most recent MassDOT-CSX agreement.Will Amtrak trains be able to travel faster in MBTA territory when the triple-track project is complete? Most of the Framingham/Worcester line trackage is currently limited to 60 MPH, except for three short stretches of track (in Newton, Westborough, and Grafton) where trains can go a bit faster. What improvements are necessary to allow trains to travel at 79 MPH (or even 90 MPH) through Wellesley, Natick, Ashland, and Southborough?
>70 might be doable on more *small* stretches in an electrified (and dual-mode Amtrak under wires) future given vehicles with better curve recovery acceleration, but it's definitely never going to be a 90 MPH railroad by its default geometry.