The other day I was speaking to a Korean friend of mine and he was telling me about Seoul's new GTX-A commuter railway line. This line opened at the end of 2024 and is part of a broader Great Train eXpress initiative that includes 3 lines (A, B, and C) and that is intended to establish a new "30-minute commute zone" surrounding Seoul. A is the first line to open. C is scheduled for completion in 2030. And already, three more lines are now being planned: D, E, and F.

What this first line has accomplished is pretty extraordinary. GTX-A connects Paju in the north to Seoul in the south. Paju sits at the northern border of South Korea (and therefore houses many US and South Korean Army bases) and has a population of over half a million people. Prior to GTX-A opening, this commute used to take approximately 90 minutes by conventional subway and up to 90 minutes by car, depending on traffic.

Today it takes exactly 22 minutes! If you're interested in seeing a complete walking video of this commute, click here.

The GTX system is a higher-speed railway line. Meaning, the trains are designed to operate up to a maximum speed of 180 km/h. Average speeds vary depending on the segment and stop spacing, but it seems to operate at an average speed of

I just spent the last 7 minutes listening to this brief historical overview of Seoul by The Urbanist, while I bounced around the city on Google Street View, admiring the coverage of their transit network and the density of their low-rise neighborhoods. 

I love Street View and I love using it to explore cities.

One of the things I liked about The Urbanist episode –  beyond it being a good soundtrack while I explored – is that it talks, albeit briefly, about why Seoul is located where it is today. 

I am always curious about this when it comes to cities. I mean, who was it that decided, yup, this is going to be the spot. Because it’s generally a pretty sticky decision once it is made.

You may also find this 2014 NASA photograph of the Korean Peninsula interesting. The nighttime sky renders up a pretty stark contrast between North Korea and South Korea.

The other day I was speaking to a Korean friend of mine and he was telling me about Seoul's new GTX-A commuter railway line. This line opened at the end of 2024 and is part of a broader Great Train eXpress initiative that includes 3 lines (A, B, and C) and that is intended to establish a new "30-minute commute zone" surrounding Seoul. A is the first line to open. C is scheduled for completion in 2030. And already, three more lines are now being planned: D, E, and F.

What this first line has accomplished is pretty extraordinary. GTX-A connects Paju in the north to Seoul in the south. Paju sits at the northern border of South Korea (and therefore houses many US and South Korean Army bases) and has a population of over half a million people. Prior to GTX-A opening, this commute used to take approximately 90 minutes by conventional subway and up to 90 minutes by car, depending on traffic.

Today it takes exactly 22 minutes! If you're interested in seeing a complete walking video of this commute, click here.

The GTX system is a higher-speed railway line. Meaning, the trains are designed to operate up to a maximum speed of 180 km/h. Average speeds vary depending on the segment and stop spacing, but it seems to operate at an average speed of

I just spent the last 7 minutes listening to this brief historical overview of Seoul by The Urbanist, while I bounced around the city on Google Street View, admiring the coverage of their transit network and the density of their low-rise neighborhoods. 

I love Street View and I love using it to explore cities.

One of the things I liked about The Urbanist episode –  beyond it being a good soundtrack while I explored – is that it talks, albeit briefly, about why Seoul is located where it is today. 

I am always curious about this when it comes to cities. I mean, who was it that decided, yup, this is going to be the spot. Because it’s generally a pretty sticky decision once it is made.

You may also find this 2014 NASA photograph of the Korean Peninsula interesting. The nighttime sky renders up a pretty stark contrast between North Korea and South Korea.