Burlington Route SW1200 9277 switches in Chicago in December 1969, in this transparency by David Leonard. Delivered from EMD in 1955, the unit became BN 235 in 1970, then BNSF 235 after the AT&SF-BN merger of 1996. Subsequently it is reported to have been renumbered to BNSF 3505, but does not appear to be on the current BNSF roster.