It's an interesting concept. Thanks for sharing.
My initial thought and constructive criticism is that it may be challenging to incorporate satisfying grade transitions with a rigid tile system. Perhaps consider creating some grade transition tiles? Additionally, transition tiles from urban...
Another recommendation for Otter Valley Railway for a very positive customer experience and good pricing. The one hiccup with OVR is that they don't do through-the-website credit card payment. You can place an order and note pay-by-phone and they will call you to process your credit card over...