A mystery tunnel under the old PRR connection to the B&O line on the east side of Norwood's Waterworks Park, looking east. This single tunnel does not match that of the rest of the subway's construction, however, this could be because this railroad line was built after the 1920s. This is also exactly in line with the subway line's route to Oakley. The fact that there's only one tunnel here seems a bit odd, but its construction is not consistent with pedestrian underpasses.