I can't point you to any photos online but I have also seen old
U-boats in the gray paint being used in a couple different UP yards. One
is nearby to me in Spring, TX north of Houston. The other was in
Something like this?
I browsed Union Pacific, Yards, 60 per page, and found this one on the
third or fourth page... probably others if you scan further.
Easy one: The gray color is to alert yard workers to take extra
caution around the gray locos because there's nobody in the cab and
the loco may move without warning at any time. (That's also what those
little signs on the loco say.)
But nobody is going to think that there might be an engineer in the
cab of the slug, because it has no cab and cannot move at all unless
it's plugged into another loco.
There's also the fact that UP apparently acquired some of the SP's
legendary thriftiness when they absorbed the SP. UP no longer
repaints their locos unless they're going to undergo some major shop
work, and I wouldn't expect the little slug to get gray paint until/
unless it gets shopped for other reasons.
(There are still a few UP "patch" locos running around the Colton
yards in the old SP Gray/Scarlet color scheme today, and the UP bought
out the SP 15 years ago!)
As I understood it, the grey one was grey to indicate no driver and the
other is a slug.
Perhaps you could explain more. I live in a small village in the UK so
have little actual experience of US railroads - although I have been
building US outline models as best I can for years.
Yes. But that doesn't mean that they have to be parked. They could
just as well have been moving -under computer control- when the
photo was taken.
> Perhaps you could explain more. I live in a small village in the UK
Okay. We have two different sorts of locomotives coupled together
here as a consist: The gray loco is an everyday diesel-electric that's
normally remotely controlled -presumably via a GPS downlink and a
computer- and a yellow/gray unpowered "slug" that gets the power for
it's traction motors from the remotely-controlled diesel that it's
Such combinations are used exclusively for yard switching over here
because the US doesn't allow remotely-controlled engines out of the
yards, and with the slug eating a lot of the powered loco's voltage
the consist probably can't get up to mainline speeds anyway. (That
doesn't matter in the yards, where the slug's contribution to the
consist's starting power is valued over the fact that the consist
can't move very quickly.)
However, the fact that these two disparate sorts of locos are teamed
up into a consist that's specialized for low-speed yard switching has
nothing to do with whether or not the consist in question was actually
moving when the picture was taken.
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