Not sure if this has already been settled or not, but Atlas did get the black walkways correct on the L&HR C-420s. A number of nice color slides on ebay over the past few years has confirmed this. None of the photos are mine so the best I can do is post a link to this ebay listing that is ending on 1/13/13. Black anti skid walkways at Laural Run PA on the 23. http://www.ebay.com/itm/RAL671-L-HR-Wre ... 25797996c2
I'm an O scaler and of course had to have the JC Penny L&HR #22. I got it from ebay back in 2001 and was fortunate enough to come across O scale caboose decals at the Mother Seton show that following spring. It is a very heavy locomotive. Problem is the horn and bell quit working. I think smoke oil got down into the chip or something. I'd like to upgrade it to have the engine sounds as well. I run it occasionally on my layout which is small but it is good enough for now.
I wish I had that N scale engine back when I modeled that 20+ years ago.