Nikko (日光) is very popular destination for the tourist from the foreign countries because it is World Heritage site. You can see lots of very historical temples and shrines.
I wrote about all train access to Nikko in other post. Please refer the link below to learn more:
Change trains at Utsunomiya station
You can get Nikko by Japan Rail Pass. If you access there from Tokyo, take Tohoku Shinkansen to get Utsunomiya. “Hayabusa” and “Hayate” do not stop at Utusnomiya station. Take “Yamabiko” or “Nasuno” to get Utsunomiya.
Take Nikko line train
You will transfer to Nikko line at Utsunomiya station. After you get off Shinkansen, move to platform #5. Mostly the train to Nikko depart there. Nikko is the last station. It takes about 40 minutes from Utsunomiya to Nikko.
You may learn more about Utsunomiya station in the link below:
Nikko line is used for not sightseeing but commuting. We do not have the luxury express train. You need to get the local train. And also these trains are not operated very often. We have 24 round trips a day. We mostly have once train a hour. Please check the time table before you go.
View Nikko Line in a larger map