Ron, I know a gentleman by the name of Tommy Aaron who lives in Tennessee. He operates "PoPcOrN's Civil War". He is a very succesful relic hunter and I know he has hunted along various railroad bridges etc. He even sent me a few old .577 Enfield bullets he recovered from under the Bridgeport, Alabama bridge John F. Roberts writes of in his diary. He may be able to help you out. Here is his email address, tell him I sent you...