Microsoft has added a new theme pack to the Microsoft Store for Windows 10 users. Titled Trains on Bridges, the new theme pack contains 10 high-quality 4K wallpapers, the description of which reads as follows:
Take in the breathtaking sweep of trains on bridges, trestles, and viaducts around the world. This premium 10-image 4k set is free for Windows 10 Themes. These images are to be used as desktop wallpaper only.
To apply and change to the most appropriate color, based on the current wallpaper, go to Customize > Colors > Automatically select a primary color from the background.