The caption wouldn't necessarily say where it is in a case like this, what I did was right click to search for the same image elsewhere on Google then check the results. When I had a shortlist of possible locations, I searched by the location name and found a couple of images for Coalbrookdale which look like the same bit of track seen from the other direction. As it is unlikely that there are two such bits of that track in the country, let alone with identical wooden barrels nearby, I concluded that the location was the probable one.
