seemed like a key piece of evidence. >> the railroad bridge had a concrete pier that was holding up the bridge structure, and there was very fresh damage to the concrete of that bridge pier. >> something had hit the point of the pier. was it one of the "mauvilla's" barges? had the "mauvilla" caused the sunset limited to derail? >> when we found the left-hand barge, there was a similar mark of scraped paint and an indentation into the metal. in fact, it kind of looked t-shaped, which would indicate that the barge hit the top or flat portion as well as the edge of it, and it kind of gave it a little t-shaped mark. >> the other barges revealed more surprising clues. the center barge also had damage. there were vertical scrapes and an indentation.