I'm frequently reminded--when proposing urban/suburban interoperation in Boston--that the differences in specs for each rapid transit line and the CR make this impossible (or, at the most optimistic, would require an enormous amount of work to be sorted out)
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What I'm getting at is this: so long as differences in specs don't prevent use of the same platforms, it doesn't matter if only *some* of the rolling stock on a suburban line is able to run through on the subway as well. Indeed, that's how an interoperated schedule would work!
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Specifically, that some trains would continue onto the subway and out the other side of the city, while others would skip the subway and just continue to the existing downtown terminal. This isn't a silver bullet for my Boston plans, but it makes them slightly more achievable.
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oh one more thing--Japanese freight trains don't appear to cause any trouble for platforms at passenger stations. I took this photo at Mizusawa in 2014, and the trains shown are stationary, but during my 2017 I also saw freights pass platforms at speed w/o issues.pic.twitter.com/EvylfWGX6y
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Less optimistic about accomplishing this in MA tho, since it would probably require a complete overhaul of freight specs, rendering them incompatible with the rest of the US network and requiring transshipment facilities anywhere that a freight line entered New England
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On the bright side, a compatibility barrier like that would be a defensive boon if New England were an independent nation, so...lemme file this idea away for future reference
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End of conversation
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