you have a non-articulated version of the Hafner M10000. Greenberg lists 23 different color combinations for both the articulated and non-articulated trains, so having an 'uncommon' color with Hafner isn't very uncommon. by far the most common version is the bullet nose, articulated, UP lettered in yellow & brown train, but frankly i'd put the 23 listed liveries as probably a low-ball minimum. if there is no lettering on your train (as with most of the metallic finishes), that is correct.
the nice part about the non-articulated sets is that you can possibly find a 1010 locomotive/ tender in a similar color for a different head end power choice. i also like the windowed observation cars.
watch out running any bell ringing Hafner on 3-rail track. if you track-share with a powered model, the bell clapper will definitely create some dazzling shorts, but even on unpowered track, it can snag on the center rail. either pin the bell clapper up into the motor (much easier to demo than explain) or get yourself some proper 2-rail track. the clapper is meant to hang down and ring the bell when it hits a 2-rail track tie, but believe me even to a Hafner fan, this can get annoying really fast.
good luck with it...gary