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Noticed that the dislodged trolly retract mechanism was mounted very high on that trolly. Suspect that an operator would have to stand on something to rewire the trolly pole to the trolly wire. All trolly cars and trackless trolleys I ever saw the mechanism is much lower on the vehicle.
 
west point said:
Noticed that the dislodged trolly retract mechanism was mounted very high on that trolly. Suspect that an operator would have to stand on something to rewire the trolly pole to the trolly wire. All trolly cars and trackless trolleys I ever saw the mechanism is much lower on the vehicle.
Click to expand...
I believe Boston did this to prevent kids from yanking the pole off the wire. The operator could reach the rope by standing on the coupler.
 
Note that the new version of the Green Line Train Protection System will be deployed in 2 phases. Phase 1 just provides a warning to the operator of a pending collision or speed violation. Phase 2 will include automatically slowing and stopping the train if the warnings are ignored, plus an interface to the signaling system to prevent red signal overruns (SPADs).

Note that phase 2 will only be installed to the Type 9 and future Type 10 vehicles. I suppose they are assuming that by the time phase 2 is up and running the current type 7 and 8 vehicles will be near retirement. Although the schedule plans for phase 2 to be complete by June 2028, whereas the type 10 deliveries will not be completed until 2031 so even if the schedule is actually met, there will still be type 7/8 cars running for some time without the full capabilities.

System Summary, from the MBTA Transition Planning slides:
• Radio communication-based system utilizing carborne and wayside equipment to determine train position to:
• Enforce operating speed listed in the MBTA database
• Provide train-to-train communication and redundant LiDAR technology to detect impending collisions
• Determine status of upcoming signal to prevent red signal overruns
Click to expand...

The system is being provided by Piper which appears to specialize in safety systems for Transit.
 

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