4 ms·
The Boston green line is one of the oldest subways in the world and it shows.
by AndrewStephens 3y ago
The Boston green line is one of the oldest subways in the world and it shows.
- gottorf 3y agoThe GLX, which is the part in question, is brand new. It definitely should not show.
- hprotagonist 3y agoit’ll show if the rail gauge matters for speed, which it does. doesn’t matter how old the carriages are. https://www.universalhub.com/2023/out-mouths-babes-green-line-extension-edition https://www.universalhub.com/2023/out-mouths-babes-green-lin...
- gottorf 3y agoI'm not sure I follow. Correct me if I'm wrong, but the Green Line (all of it, old and the Extension) use standard gauge tracks. The current problem with the Extension is that the brand new tracks are unstable and the parallel rails are collapsing into each other ("narrowing"). So it has nothing to do with the age of the rest of the system or the carriages, and everything to do with shoddy construction.
- pivo 3y agoYes, that’s my understanding, and my experience. The green line on the older tracks seems to be normal.
- hprotagonist 3y agofair enough. what i was getting at was that even well made new construction inherits many constraints from the rest of the line, though it does ease others.
- martinald 3y ago...but the actual oldest subway line in the world (between Paddington and Farringdon in London) works great. Recently got CBTC enabled so can handle 32tph (though doesn't actually run at that, though the not much newer southern half of the circle line does).
- cpursley 3y agoYep, and the old ones in Hungary work well as well!
- hprotagonist 3y agoi bet you’ve upgraded your rail gauge geometry since original construction. i’m much less confident that we have. or redone the tunnel layouts, hence all the squealing.