Later then your era but The Penn Central color guide has a picture of a F30D in Butler, Wisconsin. I think your pretty safe having one out west.
After Trailer-Train was formed in 1955 I think you could find them anywhere. I'm not sure about before that.
Here's the one's from my lists (1965).
TTX 475021 TRAILER(S) TF 425 2205 5/19/1965 43 S CGWZ 501906
TTX 475021 TRAILER(S) TF 425 2205 5/13/1965 43 S
TTX 475021 MEAT TF 2205 425 5/17/1965 90 N
TTX 475021 MEAT TF 2205 425 5/28/1965 192 N CGWZ 504206 500946
TTX 475021 TRAILER(S) TF 253 2531 7/30/1965 41 S
TTX 475021 TRAILER(S) TF 1000 2531 5/5/1965 43 S
TTX 475021 FR MEAT TF 2313 425 7/28/1965 192 N BOOKEYS CGWZ 504033
TTX 475021 TRAILER(S) TF 2531 1211 5/9/1965 42 N
TTX 475090 MEAT TF 2313 425 5/28/1965 192 N CGWZ 504029
TTX 475090 TRAILER(S) TF 417 2313 5/25/1965 43 S ICZ3000024 (STEEL)
TTX 475090 TRAILER(S) TF 417 2254 5/30/1965 43 S CGWZ504043
TTX 475099 TRAILER(S) TF 417 2313 5/25/1965 43 S NYCZ7319
TTX 475099 TRAILER(S) TF 425 2254 5/28/1965 43 S TRZ270118 (BLOWERS)
TTX 475099 TRAILER(S) TF 2313 425 5/27/1965 192 N CGWZ 504231
TTX 475120 MDSE TF 417 2531 5/20/1965 41 S PRR 200345
TTX 475120 MEAT TF 2313 425 5/28/1965 192 N CGWZ 504045
TTX 475120 TRAILER(S) TF 417 2313 5/30/1965 43 S CGWZ504093
TTX 475120 TRAILER(S) TF 1000 2531 7/29/1965 41 S
TTX 475212 TRAILER(S) TF 425 2205 5/21/1965 43 S S CGWZ504252
TTX 475212 BAKE GDS TF 2531 1211 5/10/1965 92 N
TTX 475212 MEAT TF 2205 425 5/25/1965 192 N CGWZ 504052
TTX 475212 TRAILER(S) TF 417 2313 5/18/1965 43 S DX7353
TTX 475212 TRAILER(S) TF 2313 425 5/20/1965 192 N CGWZ 504272
TTX 475264 MEAT TF 2205 425 7/31/1965 192 N CGWZ 504008
Station 2205 is Waterloo.
Jason