#### Brattle Loop

##### New member

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- Apr 28, 2020

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8 intervening stops? It's 9 by my count unless I'm misreading the station list.I saw on wikipedia that these trains will max-out at 50 mph (which I assume is the same for the entire Green Line, then?). Measuring the the extension as being almost exactly 5 miles from Tufts to Park St., at first that sounds pretty good--5 miles @ 50 is 6 minutes.

BUT: 8 intervening stops. Let's say 1 minute on average to complete deboarding/boarding for all 8 stops. So that's 8 minutes.

AND: acceleration/deceleration is considerable when there's 8 stops crammed into a mere 5-mile segment. So realistically the trains will average 25 mph? so that would be 12 minutes.

So that combines toif the calculations are right--which sounds pretty competitive compared to, well, everything, unless you're a great cyclist (and even then there are all the miseries and unpleasantries and hazards of biking @ 15 mph constantly through the asphalt jungle that is Tufts--Park corridor).a 20-minute average ride from Tufts to Park Street,

But would it in fact be longer than 20-minute on average? Am I undercalculating due to other factors? Should we allow for more than one minute to complete each stop's boarding/deboarding cycle? I don't think I've seen this computation on this thread (apologies if it's been done already), so I'd love to see someone else's arithmetic if I have it wrong.

It's unscientific, anecdotal, and somewhat dated, but back when I was a regular Green Line rider, my rule of thumb in the Central Subway (presumably extendable to the GLX, which does not have the traffic lights that mess with the surface branches) was roughly two minutes per stop (not including my origin and destinations, which were budgeted at one minute). This was a good decade ago, but it was pretty consistent (albeit not necessarily at peak times). Between the Type 7s' stairs and the awkward configuration of the Bredas (I don't know about the Type 9s, but the cab-end door of the Type 8s is appallingly awkward), GL trains can spend what seems like a while on the platform.