(English: The Forest of Yufuin), and are limited express train services operated by Kyushu Railway Company (JR Kyushu) which run from Hakata via Yufuin to Ōita and Beppu.
- KiHa71 DMU: 1989 - present (Yufuin-no-mori)
- KiHa72 DMU: 1999 - present (Yufuin-no-mori)
- KiHa183 DMU:
- 1992 - 1999 (Yufuin-no-mori)
- 2004 - present (Yufu DX)
- KiHa185 DMU: 1992 - present (Yufu)