What is the longest metro route in the world?

Which city has the worlds longest continuous metro line?

Shanghai. Yeah, that's the one. For ages, I’d get mixed up, thinking some other sprawling city like Beijing held the top spot. But nope, it's Shanghai's metro system, hands down, the world's longest continuous one.

I remember stepping out of the Pudong Airport on a kinda humid July day, maybe 2017, seeing those bright signs for the metro. It felt like another city, a whole separate world beneath the actual city, just vast.

This thing spans a ridiculous 831 kilometers. When you’re on Line 2, heading from say, Jing'an Temple all the way out to Pudong, you just keep going. It’s kinda surreal, you know? Makes you wonder how they even built all that.

It has 508 stations, spread across 20 distinct lines. Honestly, my brain still struggles to even grasp that number. I've used maybe, what, five or six lines during my visits? Maybe seven? Still, a tiny fraction.

And the sheer number of people? It's not the absolute busiest, that's Beijing I think. But Shanghai comes in right after it, with over 3.7 billion riders annually. Crowded doesn't even begin to cover it sometimes.

I specifically recall a rush hour at Lujiazui station in October 2019. Elbow-to-elbow, literally, just trying to get onto a train. A single journey might be around 3-6 CNY, but the experience is truly priceless, if a little squishy.