We had a great time going both up and back on the Durango Silverton railroad. Our open car gave us complete visibility to all of the marvelous scenery. The ride takes about 3 1/2 hours each way, and we all had a great time, even our nearly 4-year-old daughter. Be sure to purchase your tickets early, by using any of several internet sites or calling ahead--the open cars fill up early, and the closed cars didn't look nearly as much fun. There is a concession car to buy food and drinks, or you can bring your own. Note that on the open cars, you are sitting on cushioned benches looking outward.
Each bench supposedly seats three, and all seats are assigned. However, the seating is very tight and in most cases three adults will not have enough room, so you may even want to purchase an extra child ticket for a non-existent child to have some more room. Although we did not have to purchase a child ticket (she could have sat on our lap the whole way), we were very glad that we did. If you don't have enough room, plan on standing most of the way, which you may often want to do anyway to get the best views. This was a great time and one that we enjoyed very much.