I took the limited express Azusa from Shinjuku direct to Matsumoto. The car decks for the train was long as there are two trains attached and move in tandem but until matsumoto where the detachment will happen and they will then move independently to their respective destination
This is common for some trains in japan for example like the hayabusa-komachi which heads north of tokyo then splits at morioka before they move independently one to the north up to hokkaido and the other to west side of japan.
So if we are riding these type of trains we need to make sure we are in the designated cars so that we don’t go astray from our destination.