by teruakohatu
4 subcomments
- > dates back to the late 1890s and will be replaced with a modern, more durable, metal trough.
I think any infrastructure that has lasted over 130 years is already quite durable.
- Hold a chain at its ends, and let it hang down naturally. What is that shape called? A catenary and its equation is y = a cosh(x/a).
Maybe you all knew that factoid already, but I learned the name of shape only recently.
- The part relevant to the editorialized headline:
“The MBTA will perform work in December to replace the wooden overhead catenary wire “trough” in the Green Line tunnel, which is original to the tunnel’s construction in the late 1890s. The trough houses the Green Line’s overhead wires and will be replaced with a modern, more durable, metal trough.”
- San Fransisco looked at replacing their metal ladders with wood and decided to keep making the wood ones. Sometimes there's good reasons to keep the old material, the least of which is that metal conducts electricity. Unfortunately there's not many people left that can maintain it and it's probably cheaper to just keep ordering metal replacements. It still doesn't mean it's better.
https://sf-fire.org/our-organization/division-support-servic...
- If only they’d make the T fare free and run more frequently and later into the night. The C line in Brookline has the potential to be extremely convenient, but at present most of the time it’s easier to take an Uber, or drive.
- It's been a decade+ since I used to catch the Green line at Park St, but at that time it was the noisiest, squealiest station that I regularly used. Not surprising to learn that parts of that station are left over from the 1890s.
- The builders should be patting themselves on the back. The fact that some of this infrastructure was built in the 1890s is amazing.
by cbm-vic-20
0 subcomment
- I really like those service diagrams to show which stations are closed and how to get around them.
- Boston subway to replace cable duct that worked for 130+ years
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