I recently purchased a scale wheeled 6 axle MTH diesel. The Hi-rail wheel sets weren't easy to find. I got mine from Mr. Muffin and now he is showing pre-order for those. Make sure you order the wheel sets or see if you can procure from a dealer that has them in stock before you order the locomotive.
Matt
I was considering the CP heritage SD70Ace from the recent catalog. Previous MTH SD70Ace call for a 42" radius curve. My smallest curves are O-72. Would you say bad idea to purchase the fixed pilot model?