Hmmm, train museum in Fredericksburg? Please share the details.
Update: I assume this is it, Just found it, a well kept secret.
Rappahannock Railroad Museum
11700 Main Street, Fredericksburg, Virginia 22408, United States
Yep, that's it. It doesn't seem very big, but they also have some layouts, items on display, 2 cabooses (cabeese?), a baggage/mail car, a box car, and MOW equipment. They use the MOW for rides.