The more I look at the two pics, the more I don't think they're one in the same. The WM car's portholes are closer together and has an open platform, and the skirting is different between the two. The latter two could simply be cosmetic changes over the years, but the portholes?
I do like the fact that the B&W gives you a good peak at the 'plow' mounted to the front of the rear truck. Never seen a truck mounted apparatus like that? Comes to think of it, that installation looks different on the two too. Hmmm...
Neat lookin' thing all the same.