These seem to be from the upper platform of the SP station a block away. Unless I'm mistaken, this type of shed was not used anywhere on the lower level. At least I haven't seen any photos of them. If you look at some of the closeups of the sheds on the upper platform, they are identical. Even though the upper platform still appears to have all its sheds, it's possible these were picked off the end and a few piers were removed.