Sunday, 7 June 2026

Spot the Difference: The Faces of Kotoden's 600 Series

Set 627 of the Kotoden 600 series EMU
Photo: Nicolai Okkels

I'm not a native English speaker, but I suppose that "spot the difference" is roughly equivalent to machigai-sagashi, a popular picture puzzle game in Japanese. Following my post on Tobu’s 50000 series EMUs three years ago, let's try another round of Spot the Difference with Kotoden’s 600 series EMUs.

Before we get started, my thanks go to Nicolai Okkels, who kindly shared the above photograph with me. He traveled around Shikoku last year and took many railway photographs, including those of Kotoden (Takamatsu-Kotohira Electric Railroad), a private railway in Kagawa Prefecture.

The above photo shows Set 627 of Kotoden’s 600 series EMUs. This trainset consists of two 15-meter-long motor cars. It was originally introduced on the Nagoya Municipal Subway in 1974. After 25 years in service, two former intermediate cars were converted into cab cars and transferred to Kotoden in 1999.

The photo below shows Set 623 of the same series. I took this photo in 2022. The history of Set 623 is similar to that of Set 627, but there is one important difference. The biggest difference is when the cars were converted into cab cars. Set 627 (top) was modified shortly before its transfer to Kotoden, whereas Set 623 (bottom) underwent the same modification during the mid-1980s while still operating on the Nagoya Municipal Subway.

This difference in modification timing resulted in several visible differences between the two trainsets.

Now, let's take a closer look at the faces of these two trains and see what differences we can find.

First, I noticed that the cross-sectional shapes of the car bodies are different. Set 627 (top) has a more angular roof profile than Set 623 (bottom).

Second, the shapes of the front ends are different. Set 627 has a narrower forehead above the cab windows than Set 623.

Third, the front window frames are made of different materials. Set 627 uses black H-rubber window gaskets, whereas Set 623 has metal window frames.

Fourth, I found that the positions of the windshield-wiper pivots are different. On Set 627, the pivots are mounted farther from the window frames than on Set 623.

Finally, Set 627 has a headmark mounting bracket on the gangway door, whereas Set 623 does not.

Did you spot all the differences?

I'm always happy to be a railway enthusiast who can find enjoyment in such small details. I hope you enjoyed this little exercise as much as I did.

Set 623 of the Kotoden 600 series EMU (December 2022)

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