Hmm, I hadn't heard that. Do you mean that 3:59 service was only offered during the first little while, then the timetables for Turbo service were later adjusted toward the end of the 70's?
Check out this section of Japanology's Shinkansen segment, with regard to delays, and a driver stressing out about trying to make up a 15 second delay:
(This should have jumped right to 9:40 but for some reason it appears the forum does not recognize the time index suffix ("start at") from YouTube)
Check out this section of Japanology's Shinkansen segment, with regard to delays, and a driver stressing out about trying to make up a 15 second delay:
(This should have jumped right to 9:40 but for some reason it appears the forum does not recognize the time index suffix ("start at") from YouTube)