Could be I was wrong, I have to check this again, but off the top of my head, 1) no proper metro runs 200+m long double-deck trains, though with people standing it is more dense 2) Moscow Metro is 2-3 billion/year and a dozen lines, so it seems similar capacity.

_{*Lunatic*, n.
One whose delusions are out of fashion.}

Luzhkov has created a good city for the rich. The poor haven't been so lucky so far... Metropoliten (in Moscow) vividly reminds of Wells's War of the Worlds where the gloomy evil morlocks are fighting for their survival while the pretty citizens of the upper world are entertaining themselves on presentations and parties
by Andrei Baranov

Moskovskie Novosti #25/2007
(my translation)

Ah, Russian Wiki for help. A bit difficult to compare weekday ridership and yearly ridership, but the 272.8 million for the RATP section of RER A converts to an average 747,400/day, so RER A probably beats Moscow Metro lines 5 (832,862/weekday) and 3 (800,504/weekday), but not lines 1, 2, 6, 7 (most busy with 1,449,222/weekday), and 9. Based on numbers I have, there are six Japanese railway lines busier than Moscow Metro line 7.

I'll modify the text to exclude subways.

_{*Lunatic*, n.
One whose delusions are out of fashion.}