Recently salvage crews pulled up old French Trains from the bottom of Lake Gatun, that were sent to build the original Panama Canal Railway. These were sent over as part of the original excavation effort to create the Panama Canal. Sitting at the bottom of Lake Gatun for almost a century, they are actually in very good shape. Not only do they have steam locomotives, but they have a full fleet of muck cars as well. Head on over to Vintage News for more information and pictures.
Link: Recovered 100 years later: Panama Canal workers flooded a derelict railway yard in 1910