• Grand Junction Branch (The North/South Side Connection)

  • Discussion relating to commuter rail, light rail, and subway operations of the MBTA.
Discussion relating to commuter rail, light rail, and subway operations of the MBTA.

Moderators: CRail, sery2831

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  by WatertownCarBarn
 
Behind the MIT ROTC building (between Pacific and Vassar) the is an at grade pedestrian crossing of the GJ. Fairly well trafficed and lit.
  by BostonUrbEx
 
GP40MC1118 wrote:B721 runs Sunday through Thursday. OD 130PM Framingham. . . .
Great info here. About what time do they look to leave Everett, and what time through Swift on the return? Or is it too wildly variable?
  by GP40MC1118
 
It's somewhat variable.

Thursday they were very early coming back, right after the rush hour parade.

Most of the time its anytime after 930PM-1030PM coming back.

D
  by 130MM
 
GP40MC1118 wrote:Given the current track throws necessitated by the GLX extension to Union Square, any redesign to
make a direct GJ connection to the FRML problematic.
D
Apparently, nobody here has seen the plans for the "new" Swift. The connection to the GJ will be a realigned track crossing the FML #2 on a moveable point frog, and connecting to the FML #1 with a standard #10 turnout(a la Beverly Jct - albeit with a smaller turnout). I've got the plans upstairs, if you want to see them, D.

DAW
  by sery2831
 
130MM wrote:
GP40MC1118 wrote:Given the current track throws necessitated by the GLX extension to Union Square, any redesign to
make a direct GJ connection to the FRML problematic.
D
Apparently, nobody here has seen the plans for the "new" Swift. The connection to the GJ will be a realigned track crossing the FML #2 on a moveable point frog, and connecting to the FML #1 with a standard #10 turnout(a la Beverly Jct - albeit with a smaller turnout). I've got the plans upstairs, if you want to see them, D.

DAW
Will this only lead to Tower A on the number one? Will you have to reverse West towards Porter(shuffle) to continue on the Grand Junction? Or is the switching lead on the west end of BET being reconfigured as well?
  by GP40MC1118
 
Moveable point frogs are fine when the work, but a royal pain when they don't. At one
point, there was a directive requiring C&S personnel only to handthrow it when a failure
occurred. Never liked them and needlessly complicates things. A diamond with a single
power switch for No.2 Track would've sufficed.

As for the Swift caper, having not seen a recent rendering of plan, I understood that, by
example, for CSX to get off the GJ to the 4th Iron, would require coming across the
switching lead for BET. Duh...

D
  by sery2831
 
GP40MC1118 wrote:
As for the Swift caper, having not seen a recent rendering of plan, I understood that, by
example, for CSX to get off the GJ to the 4th Iron, would require coming across the
switching lead for BET. Duh...

D
So the switching lead gets connected to the Fitchburg? There isn't a whole lot of room to play with there. They will have to install more derails in BET. As the entire yard is downhill going west.
  by MBTA3247
 
Yes, along with vastly less wear to the rails. Though I've never heard of a diamond with movable point frogs, just regular turnouts.
  by butts260
 
On the Eastern Rt. doesn't the diamond at Beverly Junction, where the Gloucester Branch joins, have moveable point frogs?
  by typesix
 
BostonUrbEx wrote:So what benefit does a movable frog point have versus a standard diamond? Higher speeds/smoother ride?
Also less noise.
  by ExCon90
 
MBTA3247 wrote:Yes, along with vastly less wear to the rails. Though I've never heard of a diamond with movable point frogs, just regular turnouts.
The Reading had a lot of them, and some still remain. They were fond of British-style double-track junctions with two turnouts and one diamond, and the diamonds mostly had movable-point frogs. There's one at CARMEL, where the Warminster line diverges from Lansdale-Doylestown, and I think the ones at 16th St. Junction, where the Norristown trains diverge, have movable-point frogs. The one at Jenkintown was recently removed and replaced by standard turnouts.
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