I own the rail king, and it is a pretty nice model. just purchased the K-Line and am waiting for it to ship her, should be here by next week, and look forward to seeing how they compare. From what I've read and can see in pictures, the rail-king is of more scale size, but the K-line looks more detailed... and comes with TMCC/railsounds. Both models sell on the big auction site for about $350, plus or minus $75 depending on condition, the alignment of the stars, and which way the birds are leaving their droppings. if you have the time to wait I'll let you know how they compare side to side once the K-line arrives in a week or so. Also, might just take some pictures and see if I can't set them next to the real thing for a photo op. Being a member of The Henry Ford, I've seen 1601 many times, and she is just MASSIVE.
One side note, one of the worm gears stripped on my rail king, but it was already shot when I bought the engine. Don't know how common of a problem this might be.
