I have now seen a reference that states that the "Pegasus" was retired in 1863, so perhaps it could be used for an early civil war train. Bachmann's other historic train type, the De Witt Clinton, apparently only lasted a short time so would not be suitable. While locomotives built during the civil war would be more modern than the "Pegasus" and the "John Bull" it seems that some of these early type s of locomotives did last into the civil war.
Hamish
Hamish