Today, I dragged @StuartBeveridge to Chorley to see a fantastic bridge.

Because the railway and canal are at such a sharp angle, a normal arch wouldn't stay up. Instead, the stones are hand-carved in curves so that the joins between them are perpendicular to the bridge's weight.

@icecolbeveridge Wow. That's weird, beautiful, and impressive engineering. Thanks for sharing!

@RyunoKi Try doing the sums for it ;-) (I currently am. It's a long train journey).

@icecolbeveridge My goodness, that's a cracker of a bridge! Possibly worth canal boating for...

@virtuosew My brother did suggest kayaking under it, but I suspect that would have been asking for trouble. It really is a lovely thing.

@icecolbeveridge most tunnels are done like this nowadays, with prefabricated curved concrete elements

@songxisto Oo, that's really interesting! Is there somewhere I can read more about it?

@icecolbeveridge I don’t have any reference I just figured that out looking at images of the Grand Paris and Crossrail construction works. I shouldn’t have said "most tunnels" though, only the ones that use prefabricated concrete elements. Some elements also seem straight with a simple curve and bizarre outline to avoid joint alignment

@songxisto No worries, I shouldn't ask you to do my work for me! Thanks for the lead, I'll keep my eyes open.

@icecolbeveridge @brion As much as I love trains, my first thought was about logistics and upkeep—what happens when they need to start repairing or replacing such uniquely custom stones?

@chartier @brion Good question! It seems to have done ok for 180 years or so, though.

@icecolbeveridge Wow this bridge is amazing. I'd love to see more of it. Thank you for this picture!

@Giagia Thanks! It was brilliant to see, and I'm working on figuring out the maths behind it...

@icecolbeveridge I bet the maths are really intriguing. It is just a beautiful piece of work, and it almost has something a bit otherworldly about it, I might mean futuristic but that doesn't sound as poetic. This bridge is just lovely.

@icecolbeveridge I just found a blog post from 2018. The technical descriptions go right over my head, but it all sounds very intriguing! Don't know if you saw this:
Bridge 74A, Leeds and Liverpool Canal

@Giagia I have seen that -- it's a really helpful post!

For me, the bridge feels like it's borrowed from an alternate timeline, like zeppelins and Keanu Reeves.

@icecolbeveridge That's a fantastic way of describing it, I love that!
The way the stones form these sweeping lines at these crazy angles is really something. Very visually striking and impressive. I loved the photos of the blog post. If I'm ever near Chorley I will go check out this bridge.

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