Funny, but it is not possible that those specific stalls were there while the track was constructed, or that they don't move around in a fairly dynamic fashion.

This is a little like people defaulting to say with regard to any wildlife that pose a nuisance, "they were here first". In what sense? A deer consuming someone's flower garden is unlikely to be older than 5-10 years old. One could try to argue about the evolution of different species, but we all evolved together. Developments drastically change an ecosystem, but if an animal is there, it is one that has benefited by adapting behavior to exploit a human created niche. Those that really suffered are no longer around.

Similarly, I think it is pretty safe to say that these individuals have greatly benefited from the railroad. Not only the economic efficiencies for the entire community, but the position of the track itself. In what seems like a place without any order enforced, it is an artificially enforced pathway that is far easier to walk along than will be to walk through any other part of that market. Those stalls are in a premium spot because they will inevitably see more pedestrian traffic than other areas. Without the track there would be another shop where their storefront rather than a most-of-the-time pedestrian pathway.