Looks like there are 6 high speed trains daily Jinan-Rongcheng: 4 D trains originate at Jinan, 2 G trains 1 from Beijing and 1 from Shanghai. Trip time from Jinan 4:21 to 4:43, price second class 196 yuan 5 jiao, first class 236 yuan, business class where offered 589 yuan 5 jiao.
No slow speed railway existed to Rongcheng. The terminus for 2 daily K trains is Weihai, whereas high speed trains serve Weihai North, 54 km before Rongcheng.