Woods Canyon Archaeological Consultants has an “interesting” website with information on Southwest Colorado including the RGS, with logging & mining photos of the area served by the RR. Now many of these images have been previously published (no attribution is cited) and the navigation of the site is a little funky, (you need to click all the various tabs embedded to find the various subject matter/ and many of the images seem a little out of focus, at least on my monitor) but perhaps you will be rewarded by finding something new. Here is a good starting point:
Woods Canyon Archaeological Consultants/ SW Colorado History