Page "Seaboard System Railroad" Paragraph 7

When the merger officially took effect on January 1, 1983, all former reporting marks were to either be removed or patched with SBD initials.

Shortly before taking delivery of the L & N specified EMD SD50's, Seaboard adopted a Swis721 type font for reporting marks and numbers instead of the customized Seaboard Coast Line lettering seen on pre-1983 repaints.

To simplify it's locomotive roster and meet Chessie System specifications, Seaboard introduced a numbering system that partially became meshed within the Chessie System locomotive fleet as well as removed any existing Mars Lights or Gyralights on locomotives.

Any new locomotives purchased by Seaboard would be built to meet Chessie specifications ; which only three: EMD SD50, EMD MP15T and GE B36-7 were actually placed.