In order to understand this story, a bit of background info is required: Throughout 1994, the Atcison, Topeka & Santa Fe Railroad (ATSF) took delivery of 100 General Electric Dash 9-44CW locomotives, numbered 600 to 699. Of course, one of these locomotives bore the number "666". I found two good pics of the loco, here and here. Anyway, some people living along the tracks took notice of this and started to complain to the railroad about "the number of the Beast", a few railraod traffic controllers were aprehensive about uttering the number of the locomotive over the radio, and I think one engineer refused to drive it. In 1995, ATSF was bought out by Burlington Northern, and the resulting railroad became Burlington Northern & Santa Fe (BNSF). Since both railroads had locomotives bearing the same numbers, many former ATSF locomotives were renumbered so they wouldn't have the same road numbers as the former BN locomotives. This was seen as the perfect opportunity to deal with the problem, and the #666 was renumbered to 599 in 1998 (none of the other members of the former ATSF 600-699 series were ever renumbered).
This is not the first time this has happened. Union Pacific had a locomotive numbered 666 back in the '70s (it was retired in 1985), and they to had to renumber it for similar reasons...
Now, here is where it gets really interesting: CSX Transportation also has a locomotive numbered 666 (picture). Since CSX operates in the entire eastern half of the US as far west as Chicago, this locomotive would frequently be right in the middle of the Deep South, yet AFIK, it has not been renumbered, despite having been in service for several years
![Shocked :shock:](./images/smilies/icon_eek.gif)