They recommend Shinkansen because the "raumen museum" (sic) is a short walk from Shin-Yokohama station. I regularly take the Shinkansen from Tokyo Station to Shin Yokohama. In this way, I can reach my client at Shin Yokohama in about 20 minutes - rather than almost one hour by regular trains and subway connections.

It's in no way comparable to taking a 747 to anywhere, since it takes longer than that for a jumbo to board and make its way to the runway.

My biggest gripe with the raumen museum is that it felt like a rip-off to me. Paying an entrance fee for the privilege to stand in line in a 1950s-theme yatai-mura with rather expensive ramen shops... not my idea of fun. The person I went with did say that the ramen were the best he had ever tasted. I think I've had equally good ramen in other places.