I might suggest a slight change, tho it probably won't make much difference to the game play: I'd think that Donner Pass (far more notorious than 15 Tunnels) should have the Poor Conditions, since eating your neighbor is slightly more horrendous than an avalanche. Yes, I get it, this is a train/rail map and avalanches do far more damage to a train than cannibals do. Yet the notoriety of Donner Pass carries far more weight to the average individual's mind.
Overall, tho, this is a beautiful map...period pictures, historical value, train-themed artwork, and an unusual scenario where one seldom attacks the other to make it more of a race (like it was to the golden spike) make this map very special. Kudos to all aspects of the design and implementation!