Do you remember my post about Yotsuya Station last year? Today, I’d like to share a small but interesting discovery I made there afterward.
While photographing a Marunouchi Line train emerging from a tunnel and approaching the elevated Yotsuya Station, I noticed something unusual beside the track—a small yellow vehicle (please see the bottom photo in my blog post from October 16, 2025).
It was a railroad speeder, a type of small maintenance vehicle used on railways. Unfortunately, I didn’t have a telephoto lens with me that day, so I couldn’t get a clear shot.
After that, I returned to the same spot, determined to try again. This time, I succeeded. Please take a look at the top photo. Yes—this is Tokyo Metro’s railroad speeder, Unit 1, used on the Marunouchi Line. It is a diesel-powered maintenance vehicle built by Matsuyama Jyusharyo Kogyo (MJK), known as Type MR2618.
According to MJK’s catalogue, the MR2618 is designed to transport track maintenance staff. It is about 3 meters long, weighs 4.2 tons, and can carry up to eight people. With a work basket installed on the roof, it can also be used for overhead catenary maintenance. However, the Marunouchi Line uses a third-rail power system instead of overhead wires, so this function is not actually needed here.
Now, here’s something I found particularly interesting. Did you notice the angle at which the speeder is parked? If you look closely at the photos, you’ll see that Unit 1 is placed on a stabling track that crosses the main line at a right angle. There is no switch connecting the two tracks. So how does the speeder get onto the main line?
The answer is surprisingly clever. The vehicle is equipped with its own turntable, allowing it to rotate and align with the main track. I would love to see this process in action, but that’s very difficult—because Unit 1 is usually operated only after the last train of the day has finished running.
A bit frustrating for a railfan, isn’t it?
