I don’t know a whole lot of details. If you look at JFK/UMass station on Google Maps, and look at pictures of the incident, the derailed car is basically immediately underneath the Columbia Road overpass (and you can see the doomed signal bungalow between the tracks). This is also right at Columbia Junction where the Ashmont and Braintree lines split; but immediately north of here is a branch to Cabot Yard, one of the main maintenance facilities. It doesn’t seem like access to Cabot Yard should be impacted (beyond having to manually dispatch trains through JFK/UMass Station).
My gut feel from trying to ride this morning is that they were running Ashmont trains at normal Ashmont-train frequency, and Braintree trains at normal Braintree-train frequency, and weren’t attempting to run more trains on the northern half of the system. (I think the best they could do is an Alewife-Park Street short train, but it’d still help Davis-Kendall commuters, for instance.) Like my initial post suggests I don’t know what actual headways are, I’ve seen several comments suggesting it’s more than twice normal but don’t have data.
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Date: 2019-06-14 02:39 pm (UTC)My gut feel from trying to ride this morning is that they were running Ashmont trains at normal Ashmont-train frequency, and Braintree trains at normal Braintree-train frequency, and weren’t attempting to run more trains on the northern half of the system. (I think the best they could do is an Alewife-Park Street short train, but it’d still help Davis-Kendall commuters, for instance.) Like my initial post suggests I don’t know what actual headways are, I’ve seen several comments suggesting it’s more than twice normal but don’t have data.