Limited Express Super Inaba (スーパーいなば) connects Okayama (岡山) with Tottori (鳥取). It is connected with Shinkansen and Sunrise Izumo/Sunrise Seto. This is the fastest access to Tottori from Tokyo by Sunrise Seto and Sunrise Izumo. If you access to Tottori from Okayama and to the west from Okayama, such as Hiroshima, Hakara and all places in Kyushu and Shikoku. But this train goes through non JR line, Chizu Kyuko Railway. It is operated on same route as Super Hakuto between Kamigori and Tottori. That means you need to pay extra if you use this train by Japan Rail Pass. If you don’t want to pay extra, get on Limited Express Yakumo from Okayama to Yonago and transfer to another Limited Express Super Matsukaze or Limited Express Super Oki to Tottori. However travel time of this combination is at least 1.5 hours longer than Super Inaba. Sometimes it may take more because of connection at Yonago.
Super Inaba is the best route to Tottori from Okayama and west part of Japan anyway. I will show you about route, schedule and accommodations.