I recently came across the Barriger Library collection of old USA steam railroad photographs. Lots of inspiration if you model such things. Plenty of pleasant browsing even if you don’t. The photos are not always of the best quality, but are often interesting. In the Lehigh Valley section there are a whole load of pictures of ‘the open road’ – just main lines with no stations or trains included. These are very different from the usual album.
The link to the Flickr collection is here.