This is quite sudden but just imagine. You learned through social media that your favorite idol is in your nearest station. You take your camera to the station and wait for him (or her) at a spot with a good view for a while. Five minutes later, you find that he (or she) is walking toward you. Then, you realize that the idol isn’t alone. He (or she) is together with two other famous, good-looking idols. What a stroke of luck! You succeed in taking a picture of the three idols in a single image.
What do I want to say? Sorry. My metaphor was a bit long-winded. Please replace “idol” with “train”. That's what happened to me. Seeing is believing. Please look at the top photo. JR East’s three trains, namely the DMU KiYa E195 series (left), the EMU E259 series (center) and the EMU E231-500 series (right), are traveling together. The KiYa E195 is the rail carrying train… very rare. The E259 is the good-looking airport access train. And the E231-500 is the famous commuter train on the Chuo-Sobu Local line. I succeeded in taking a picture of the three trains in a single image at Hirai station on the Sobu line. That was my super lucky day. I'm still buzzing with excitement. I think you'd understand my emotions if you are also a railfan.
Incidentally, I’m showing the other important train on the Sobu line, namely EMU E235-1000 series, in the photo below for your information.