C branch already has TSP. The town of Brookline already implemented it a few years ago.
Did the town install some system to detect a train? Because the lights on the C are the least bad out of the three main surface branches. I thought Brookline had installed the lights to be TSP-ready if the T had ever gotten on board with it, but from what I had heard the T did not want to implement it on our end. This is an area where I am not sure about the specifics, to be honest.
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I believe this would have been North Station given the person was there because of the OL shutdown. I also misunderstood them. It was one of the various people helping with the diversion that operated the key to close the door as they were departing, not the operator of the train itself. So it sounds like someone just closed the door from the outside instead of the inside, but I'm still confused as to why the operator couldn't just do that themselves.
Good question.
I have used my key to close doors for operators at Park Street this week but not the front door - always the center doors, or the rear left door when it's left-side or all doors. Perhaps there was some issue with the door toggle switch. Closing the front door with the key with the operator inside seems a bit unnecessary.
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It is absolutely ridiculously insane that neither the B or the C go to North Station. With only the D directly serving North Station, the headways from North Station to Kenmore in a 1 seat ride matches that for a single branch (the longest branch), which means atrocious headways.
Riders would often be much better off taking the E from North Station or Haymarket all the way to Copley, then transferring at Copley for Kenmore service. Going eastbound from Kenmore, riders would need to board a Gov't Ctr streetcar to Park or Gov't Ctr, and transfer again for Union/Medford service. However, this makes several commutes just plain awful.
As someone who commutes into North Station regularly, and will be operating on the B and C branches via CR four days a week for spring schedule, this is going to make my life a little more annoying (especially with the Lowell Line construction schedule that was announced with 10 days' notice cutting the train I was hoping to take on Mondays and Tuesdays). Recently I was at Kenmore trying to go home from work via North Station, and I was on a B train being held so a C train could pass. A D train was 2 minutes away. I got off the B, jumped onto the C, and gambled on the C just beating an E (that I didn't know if one existed) into Copley Junction. I figured "hey worst case, I will grab the Union train at Govy". Plan worked to perfection, and I actually probably would have missed the Lowell outbound if I waited for the Union.
This also contributes to post-event crowding at Kenmore, as someone who has taken the Green Line to Sox games. People needing service to Haymarket/N. Station or beyond get screwed. Last time I went to a game I pretty much screamed in excitement standing at the right-side door as I saw a Medford train at Copley Junction waiting for us to pass, I got off the train and hopped on the much emptier Medford train since I had some time to kill.
Aside from baseball games, only 1 branch from Kenmore to North Station causes real problems for daily commuters as you mentioned. And it's not like this is a new problem - prior to the C getting cut back, the D looped at Govy and the B at Park. It's like there is some aversion to running more than 2 branches to North Station. (When the C ran to North Station, there was nothing past there due to GLX construction, so only having 2 branches made sense; now that we have 2 terminals beyond North Station it's a different equation.)
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There seems ot be an unadvertised slow zone in the southbound/inbound direction inside the North Station turnback, and it is not shown on the MBTA speed restriction dashboard. In the southbound direction there is a 5 MPH sign followed by a "RESUME SPEED" sign in quick succession.
In the northbound/outbound direction it is 6 MPH (10KMH), before turning to 15 MPH (25KMH) right at the incline.
I looked at our internal system recently during a boring overnight at Inner Belt. No slow zones there -- a lot of the Turnback is just a slow area by design. There are just some speed signs that they have been too lazy to properly address which leads to inconsistent speeds by operators (there is a notorious one from Boylston to Arlington westbound, where it's 25 but there is tape all over the signs and one was previously covered up by a trash bag. I used to do 10 over here till I checked the internal system for the first time and many people still do. There is also a new area of ambiguity just before Kenmore eastbound coming out of Beacon Junction; after the switch the speed 20 signs are gone so people don't know if it's 6 (Beacon Junction speed), 10, 20, or 25.
As for the Turnback itself - Northbound it's 15 from the end of the platform all the way to the double red, then 6 as you mentioned from the double red signal at the first switch to the incline. Southbound it's 15 until just before you dive into the underground area, then 6, then 5 over a walkway from the official's office to the storage/turnback tracks, then the resume speed sign you mentioned then a 15 sign that is covered up which, surprise surprise, leads to a lot of inconsistency.
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Would there be signal issues at the turnback if 4 branches ran to North Station? Since you mentioned last time that D/E trains to and from Science Park need to wait for the turnback to clear before entering the portal, I'm concerned that having more trains use the turnback may disproportionately affect D/E's performance here.
You are correct that a train needs to mostly clear the area of the turnback for a train at Science Park to get the signal; however, this only applies to a train on the normal through tracks (something I may have failed to mention). If there is a train on the middle tracks, they need to push a button before getting the signal to proceed and setting Signal 712 (Science Park) to hold red. With proper dispatching, you can tell the trains to hit the button right as a D/E is passing so the B/C can follow them right out, and slot them before the next D/E. A redesign of the signal system is not a bad idea either to allow trains to get closer to the switching area.
It's a problem that can be overcome with good dispatching, and potentially re-working the signal system. More scheduling discipline would be necessary too. We have the tracks at the Turnback to make it work. If you get bunching, you'd always still have the Govy loop in your back pocket, or you can extend one to Union or Medford.
I would suggest extending all B/C trains to North Station during the summer and fall schedules as a trial program. Give it a serious shot, and adjust strategy as needed. If it's truly an operational issue to have two branches using the turnback with two running through, then cut one (but not both!) back to Govy. The B is the natural candidate, but with how busy of an area Comm Ave is, I'd almost rather make the C the short one.