Originally Posted by
armagebedar
A Shinkansen wouldn't reduce the amount of time significantly vs. existing services. Shinkansen trains are limited to approximately 100 km/h between Shin-Yokohama and Omiya, which is about as fast as normal trains on the Tokaido/Utsunomiya lines.
By the way, you should be able to get from Totsuka to Kasukabe in about 1.5 hours, changing trains once at Kinshicho (or less than 1.5 hours if you're willing to change trains twice).
Agreed with all of the above. Totsuka to Kasukabe is 3.5 hours because it actually takes me 45 minutes (or more) on each side of Totsuka and Kasukabe. Stations are so far apart in Japan. In many cases, its good, in some cases, not so good.