Jan 12, 2017 - 8:33 AM
Welcome to MySwissAlps Rushfan!
Your Eurail Select Pass will give you a 25% discount on the entire trip. What's included in the pass can be found here: myswissalps.com/ eurailselectpass/ validity. Be sure to download the map too.
Note that the location names are Interlaken, Kleine Scheidegg and Grindelwald Grund. That helps when you are looking for train schedules.
I'm not sure what you mean by the required hike to the train. There is no hike involved in this trip, unless you want to.
The Jungfrau Railways have changed their website recently and things are a bit hard to find, but they are working on it. The site is available in English as well. You'll find a link to their page with prices if you scroll down on myswissalps.com/jungfr aujoch/tickets. The regular price is CHF 210.80.