Thanks for the tips; I will try Portra 160 NC as well. Skin tones don't matter to me for trains but a long tonal range is critical. I can mask and punch contrast locally in areas that I need it in post processing. For B&W my favorite films are Plus-X and Tri-X for the tonal range. Ektar 100 would likely be nice for overcast days as long as I keep the sky out of the picture.