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Blue Line tunnel was built first in 1904, Orange Line tunnel was built later in 1908 and had to have off set platforms because of street width and restrictions from the location of building foundations

If a northbound train is on the platform, it allows the dispatcher to route it back southbound from that track, which it couldn't do if the next Alewife train had already passed the interlocking and was committed to the route. Conversely, a southbound train won't have clearance to their platform...

An automated system is going to maintain the ability for a dispatcher to cross-back a train at Harvard at any time, which requires keeping the track clear from the interlocking to the platform until the train has cleared the platform (northbound) or cleared the interlocking (southbound). The...

It's an automated interlocking that is operated remotely by the dispatcher by selecting routings. If a northbound train is brought onto the platform at Harvard and crossed back, the track must be kept clear back to the cross-over, if the train is crossed back first to the southbound side, the...

There is also an interlocking that controls the cross-over south of Harvard. If a train is occupying the section, the next train can't enter until the one ahead has cleared the interlocking, since it could be routed for an opposing move to cross a train back at Harvard. It is 3 minutes from...

It was more than slightly better when Government Center was opened, it was tremendously better. The transfers from Red/Green and Green/Blue all require less walking than Blue/Orange and Orange/Red and the combined Green Line frequency between Park and Government Center is better than the Orange...

However, the peak demand period for people using Red/Blue would be from Revere/East Boston to Cambridge in the a.m. and from Cambridge to Revere/East Boston in the p.m. In the a.m. right now, Red Line trains are carrying 10,000 per hour at the busiest hour between Broadway and South Station but...

It's four-track from Boylston to Park but goes back to only two from Park to Government Center. All four existing lines pre and post Government Center being closed for construction use the two-track segment between Park and Government Center.

What would be the point of an extension to Forest Hills? The Orange Line already provides service to Forest Hills and Green St., the old pre-1987 Orange Line never had that many local riders traveling just between Forest Hills and Dudley, the old Egleston Sq. station catchment area is still...

If the auto share for the corridor is already low, where are the diversions to the light rail line coming from?

Note that for the past year since Government Center closed, the number of people on the Orange Line making the Red/Blue transfer has increased tremendously, and in the evening peak, it results in the platform at Downtown Crossing northbound being packed even more so than it previously was.

There is no fixed block, but there is still the distance between the trains dictated by the braking rate of the equipment. The set up at Harvard with average peak dwell times and a 10 m.p.h curve literally starting at the southern end of the platform followed by an interlocking, is unlikely to...

The primary purpose of Silver Line phase-III was to provide improved connections from locations on the Green Line and Orange Line to the South Boston waterfront by providing a two transfer rider (Green/Silver or Orange /Silver) vs. the present three-transfer ride (Green/Red/Silver or...

I think it has more to do with assumptions made in regional demand models. The proposed Green Line, based on the higher-capacity of light rail vehicles, would operate on a 12-minute peak headway while the SL4/SL5 runs about every 4/5 minutes for both routes combined. The model would assign an...

Just looking at some older data from 2006 (which I have a hard copy but doesn't seem to be on line anywhere), the line volumes (total people on all the trains) leaving Central from 8-9 AM (the highest volume hour for the day) was 8,691, it dropped to 8,142 leaving Kendall, and then 7,641 leaving...

There is a utility room and the path would also need to get an easement through the basement of the building with Marshall's (one time Woolworths) which would also be expensive. However, it's hard to imagine that either of those expenses combined would be anywhere near the cost of extending the...

The present three-seat ride involves using a service that runs every 1.5 minutes in the peak for the middle leg (at least when Government Center station is opened). Reducing transfers makes the ride more attractive, but the negative impact of transfers can be partly mitigated by high-frequency...

The Silver Line Gateway service from Chelsea will stop at Airport Station

For a half-hour period the Red Line runs 20 tph. In the PM there are 10 departures from Alewife between 4:43 PM and 5:13 PM, there are two extra Braintree trains that break up the regular alternating pattern of Ashmont/Braintree service. There is a also a brief burst of extra Braintree service...

The "max load" points on the Red Line during the peak are between Central and Kendall on the northside and between Broadway and South Station on the south. The max load points on the Green are between Hynes and Copley. Red/Blue does nothing to relieve crowding on the Red Line at its two most...