The Tobu terminal station in Tokyo for trains to Kinugawa Onsen is Tobu Asakusa Station, which can be accessed by subway (Ginza and Asakusa lines). Travelers have the choice of fast and expensive limited express trains or slower but cheaper express and local trains.
There are one or two limited express trains per hour between Asakusa and Kinugawa Onsen, which take about two hours and cost around 2500-3000 yen one way. Some connections require a transfer at Shimo-Imaichi Station. By express and local trains, the one way journey costs only 1580 yen, but takes at least half an hour longer and requires one to three transfers of trains along the way.
Tobu offers various passes, which include the round trip from Tokyo to Kinugawa Onsen as well as unlimited use of trains between Kinugawa Onsen and Nikko and buses in the Kinugawa Onsen area. Note that the passes do not cover the supplement fee required on limited express trains (around 1000 yen one way). The Japan Rail Pass and other JR passes are not valid on these Tobu trains.