While I know that I may get dissenting opinions on this issueNot sure how this fits, or how much this was an actual policy, but in the
back of my '53 ORER reprint there's this list of order of preference for
loading cars... won't reproduce it here, but basically it says to load
foreign cars to go as close to home as possible, so if you're ACL and have
a PGE car and a WP car and an ACL car available, and you've got a cargo
for Idaho, then you load the PGE car, because this will get it closer to
its home road...