I saw this movie in the early 80’s but I think it was older, mabey 60’s or 70’s.  The movie involves a group of people riding a train that stops in the middle of nowhere. The group gets off the train and come upon some type of ruins. After dark several crypts open up and skeletons armed with knives and swords emerge and start killing the members of the group. I remember the end where the lone survivor, a woman, is riding a horse to get away.  The movie may have been Italian dubbed in English.