At the B and O Railroad Museum there are two rides, the Happy Trail and the Choo Choo Blueville. There is also usually a Kids Zone with toys, and on weekends they have story times and activities. On the first and third Thursday of the month from January to October they offer a toddler time with stories and train games.
The museum itself was the largest train museum I've ever seen. The museum comprises the oldest and most comprehensive American railroad collection in the world. Its 40 acre campus has several sections and allows you to walk through all of the different types of train cars, plus see different types of trains from different eras. I actually learned a lot about the history of trains while walking around. It was on this campus that American railroading was born, and where in 1829 the first commercial long distance track was built.