Originally Posted by RichardInSF
Don't count on the seat. The Oedo line cars are smaller than the older subway lines (it's been criticized for this) and as a result is often way more crowded.
Still, if you are switching at Aoyama 1 Chome, you are on the train only for a few minutes.
I may be mistaken as I have only taken this route less than ten times. Each time, the train is totally empty heading from Tochomae to Roppongi as the train starts in Tochomae. The Oedo line is strange in that it is a circle along with a spur. For example, to get from Shinjuku Nishiguchi to Roppongi on Oedo line you can go to Tochomae and change trains or take route clockwise with a trip that is three to four times as long. I made the mistake once of going to Shinjuku Station and mistakenly following signs to Toei Oedo line at Shinjuku Nishiguchi instead of finding the Toei Shinjuku station. Not only did I have a long walk to Shinjuku Nishiguchi but I ended up back at Tochomae to change.
Maybe it is just me but I find that the "old timers" have nothing good to say about the "relatively new" Toei Oedo line while us newbies seem to find it convenient.
Marc