JR Hokkaido testing first Series H5 train on Tohoku Shinkansen May 26, 2015 | Asia Pacific News JR Hokkaido Railway Company (JR Hokkaido) has started testing on the first Series H5 train set from Hokkaido to Honshu through the Seikan Tunnel. The train has 10 cars, the capacity to carry 731 passe... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password