• Single track rapid transit

  • General discussion of passenger rail proposals and systems not otherwise covered in the specific forums in this category, including high speed rail.
General discussion of passenger rail proposals and systems not otherwise covered in the specific forums in this category, including high speed rail.

Moderators: mtuandrew, gprimr1

  by scratchyX1
 
STrRedWolf wrote: Sun Aug 28, 2022 9:10 am Baltimore's LRT was built so that they had a lot of single-track lines and headways of 7.5 minutes... but it was also built on pure politics and a floated bond. The bond's been paid back for quite a while, and they got Federal funding for double-tracking all the way up to a small section where there isn't much room for another track.
At the north end, where it's so bendy, the speeds are low.
And leading into the airport station.
And sadly now that it's double tracked... 7.5 minute headways are wishful thinking.
  by Arborwayfan
 
How long is the stretch of single track that could not be easily doubled? ROW including underpasses, culverts, etc., would fit double track as far as West Roxbury station. What about between the Needham stations? I'm just wondering if the OL could be extended out to Needham Hts with just half a mile or so of single track over the river and marshes. How long of a single-track segment maybe gauntlet track, even--could be handled without much effect on headways?
  by ExCon90
 
That appears to be manageable as long as there are two tracks with an island platform at the outer terminal.
  by edbear
 
The Needham Branch was once double tracked from Forest Hills to West Roxbury.
  by HenryAlan
 
Arborwayfan wrote: Sun Sep 18, 2022 7:29 pm How long is the stretch of single track that could not be easily doubled? ROW including underpasses, culverts, etc., would fit double track as far as West Roxbury station. What about between the Needham stations? I'm just wondering if the OL could be extended out to Needham Hts with just half a mile or so of single track over the river and marshes. How long of a single-track segment maybe gauntlet track, even--could be handled without much effect on headways?
Most proposals for Needham Line conversion to rapid transit do not include the Orange Line going much past West Roxbury. An infill station around the VA Hospital/West Roxbury Education Complex is sometimes suggested, but nothing beyond there. Needham itself would be served via a Green Line spur off the D-Line. Not sure exactly what Tallguy has in mind, but I don't think any proposal for the OL to cross through Cutler swamp is likely to go anywhere.