This wagon fits the Stephenson's Rocket locomotive
The locomotive can be found here.
It can be used as a passenger wagon. As well as it can be used for cargo. The passengers sitting in the wagon is a scan of myself. Made by my son.
The wagon is assembled similar as the coal and water wagon. What is new are the doors on the long sides. Before they can be opened, ensure that there is a hole straight through the hinge. Then insert a copper wire or similar wire. Then just open the doors, and smile.