UP Steam is the must-have app for any historic railroad fan.

UP Steam gives you:

- Real-time GPS location of the UP's steam locomotives No. 844 and No. 3985
as they travel across the UP rail system.

- Up-to-the-minute schedule of the latest UP steam excursion.

- Notification if UP steam is scheduled to be within 50 miles of your current location.

- Photos, video, descriptions and history of No. 844 and No. 3985.

- Ability to submit steam photos taken with your iOS device for inclusion in the UP Facebook photo album.

- Real-time Tweets tied to twitter.com/up_steam.

- Ability to "check in" with the UP's steam locomotives using Foursquare.