OK, here's a start: The CF7 book shows 311L became CF7 2494, now Florida Central 49, and 311C (45L) became Cf7 2558, Pioneer Valley 2558. Here's a shot of 45: Pictures of ATSF 45 Given that 45#..... http://www.locophotos.com/~locophot/PhotoDetails.php?PhotoID=98269 That has the frame number and date; remember they were delivered as XX-L-A-B-C (four-unit sets) so all would have relatively close build dates and frame numbers.
