the place at which the train was to stop in the station was indicated by an official with an unfurled red flag or, during the hours of darkness, by a red light. this might relate to an oak tree on the spot now occupied by the market house or more precisely the column there. the office was located on the west side of south sixth street, between chestnut and market streets. by 1816, front street was extended to the east to connect to palace street. it is also said to spit fire. 