Do you know if there is a place where i can store my case at Shanhaiguan railway station?

I am getting a train to Shanhaiguan, I intend on visiting Laolongtou and First pass great wall, and then will get the train to Qinhuangdao. Is there somewhere I can store my bag (small case on wheels) at Shanhaiguan railway station for about 4 hours?

Thanks in advance