I have wanted to see some more SP diesels. Here are some of my ideas: -Fairbanks-Morse H-24-66 Trainmasters (in Black Widow and Red/Grey paint schemes) -SD7s or SD9 "Cadillacs" (Black Widow and Red/Grey) -ALCO PA-1 A & B units (Daylight livery) -ALCO RSD-15 "Alligators" (Red/Grey)