Came across this interesting map viewer similar to google earth or maps but has old aerial images from various dates, Including aerials of Both Chama, Durango and Alamosa dating back to the 50's & 60's. Type the city name in the search bar and it will come up in a map view, you can select the various available dates in the bar on the left side of the map. Pretty interesting to see the layout of the yards and such even though some of the aerials are fairly grainy. Link here: [
www.historicaerials.com]