Do you know "America on the Move" ?
It includes an online exhibit by the Smithsonian National Museum of American History.
>>> America on the Move shows the evolution of transportation in the United States. You can also learn and test your knowledge with games : each game requires you to analyse information about the history of transportation.
Why not play "Drive through time", for a start ?!
Click on this old train...
... you'll have to stop a spinning clock to select a year in the past ; then, you can select a scenario and the appropriate mode of transportation for that scenario's era.
an exhibit (exposition)
spin = turn around and around, especially fast