I'm familiar with Through Freight crew districts, at least two of them...
Milwaukee Road, after the Pacific Extension (Lines West) were abandoned:
Savanna, IL to Bensenville (Chicago), IL.
Savanna to Dubuque, IA.
Dubuque to St Paul, MN.
St Paul to La Crosse, WI.
La Crosse to Portage, WI.
Portage to Milwaukee, WI.
Milwaukee to Bensenville (Chicago), IL.
Savanna to Ottumwa, IA.
Ottumwa to Kansas City, MO.
Galesburg, IL to Cicero (Chicago), IL.
Galesburg to Creston, IA.
Creston to Lincoln, NE.
I don't know about passenger crew districts, but I can try and find out if the above is insufficient.