Definitely a poorly produced segment when you consider that the R46's are only some 12 years or so newer on average (midpoint of delivery schedule) than the R32's and the C actually runs R46's in summer months. I agree the better comparison would be between the C and E trains. The C is bad because it runs only 8 cars (for no reason, unlike the J, L & M whose platforms cannot accomodate trains longer than 8cars) which causes overcrowding the 1st and last car at times, only runs R32's (aside from the summer months) and is the only line to run the R32's. The E ran only R32's up until almost 4 years ago as R40's and R42's started to appear in mid 2008 with R160's coming in late 2008 with the line all R160 by mid 2009. Unlike years ago when many types of cars ran on any 1 line, most lines run only 1 type of train today. Of course keep in mind the R160's retired fully R38's, R40's (slants and M's), R42's and R44's so that the system has fewer types of cars now than it had prior to 2000 when NTT;s first came on the seen.