Santa Fe tried many combinations of locomotives to pull it's York Canyon, NM to Kaiser Steel in Fontana, CA coal trains, often in solid sets. One of the last combos they used was six of their ten ... (more)
ATSF (Santa Fe) four EMD GP40X's 3800, 3806, 3802, 3805 at Barstow, CA.
These hit town about the same time as SP's did and of course there was the railfan campaign to get as many shots as soon as possible. Experimentals are always interesting.