Forgot to add, silver trucks on B&O streamlined cars only lasted a few years after delivery. Black paint quickly covered them.
S. Islander
Thank you for the info. I've been slowly putting together a plan of attack, and reviewing some old pictures.
I think painting the roof black, filling in the aft skirt holes and redoing the corner grabs and stirrup steps, and adding some roof vents and side skirt grills from Scale City Designs will make for a convincing 'stand-off' model. Also need the rear train line details. I will probably tone down the yellow a bit, too with a light overspray. I found some great 2-rail trucks from American Scale Models, and plan to paint them black as well. Lastly, I will probably retain the side skirt, because it is so nice, and just the thought of taking a razor saw to it wears me out, haha. I have a few more projects before this one in the queue, but whenever I get around to it I'll be certain to post the results.
Also, nothing against the K-Line model. They are very nicely weighted, not too hard to find and most excellent for the price.
Here are a couple pictures I have been referencing, both a newly-commissioned observation and after some years in service, which reflect all the differences you have noted: