Look close there is a hint.
ATSF GP7 freight with loads
Scratchbuilt from styrene Top O' Texas Drilling yard in foreground
ATSF GP7 freight
Scratchbuilt pens from ATSF plan #2
Reefer string at Hartley, TX
E8A/B #82 mail/express leaving Amarillo depot headed south to Canyon, Hereford, Bovina, TX and then to Clovis,NM