Changes were made to the 1 on May 12, 1901, when it was swapped with the No. 17 Streetcar (the St. Paul Street Line) and moved from Charles Street to St. Paul Street north of North Avenue, ending at 25th Street. The 1 was extended east over 25th Street to Greenmount Avenue on May 1, 1903. The route south from Druid Hill Park was changed to Fulton Avenue and Mosher Street on December 1, 1926, the day the No. 21 (Preston Street–Caroline Street Line) was taken off these tracks and rerouted south to Lombard Street; the old route on Gilmor Street north of Mosher Street was abandoned. On August 1, 1929, the No. 11 (Bedford Square Line), which had been a branch of the 17, was moved onto the Guilford Avenue Elevated, and became a branch of the 1, running between Druid Hill Park and Bedford Square. The 1 was truncated to west of downtown, and the 11 replaced with buses, on June 22, 1947 (the No. 8 Towson Line was temporarily moved onto the Elevated), and on May 9, 1948, when most routes were removed from Baltimore Street, the 1 was sent south from downtown via Sharp Street in order to replace the No. 19 Harford Avenue Line. The 1 was replaced with trackless trolleys on August 1, 1948.