Passenger cars in 1871

From: "Stephanie Whitson" stephanie@stephaniewhitson.com

I am a fiction author working on her 18th published novel and have searched for hours to discover what a passenger car on the UP looked like in 1871. I have an emigration society leaving from St. Louis headed to a fictional town in western Nebraska ... but I don't know how to accomodate them. They do NOT have a Pullman palace car. Just a normal passenger car. Can you help me?

Main questions: How many passengers per car? Were the seats padded at all or wooden benches? Did the windows go "up" and "down" Would smoke from the engine have been problem inside the car if the windows were down?

Thank you for any guidance you can provide.

Stephanie Grace Whitson