days was removed, along with the catenary supports, for the World War II scrap drive of 1943. The connecting switch from the White Plains Road Line was not regularly used to bring in extra equipment or lay up a train on the Dyre Avenue Line itself until November 1952, and then only via new switches and the former Track 3, now Y1, at East 180th Street station. By this time some middle trackage had been restored as “Y3 and Y4” through Morris Park station and south of Dyre Avenue. The Y4 siding was later extended from Morris Park toward, but not to, Pelham Parkway by July 1971. On March 28, 1955, the NYCTA contracted with the New Haven Railroad (NHRR) for the installation of a non-electrified siding coming off NHRR track 1 below East 177th Street and using what would have been the alignment of NYW&B Track 2, track Y4. Third rail was installed north of East 177th Street, where the siding also swung over to the alignment of NYW&B track 4, track Y2 so as to line into the existing Y2 track at the local side of the station. In March 1954, the old gate cars were replaced by Hi-V cars. In October 1956 several Steinway cars were assigned to service on the line, and continued to serve the line until through service began. Improvements The Dyre Avenue Line was connected directly to the White Plains Road Line north of East 180th Street for $3 million and through service began on May 6, 1957. The connection was originally supposed to open in 1950. Two days prior, on May 4, 1957, the operation of the line was transferred from the IND Division to the IRT Division, making it the IRT Dyre Avenue–East 174th Street Line. The project was started in 1949 but was delayed because the necessary subway cars for the service were not available. With the connection, the line became part of the IRT Division. Night service would continue to be operated by a shuttle. At this time, the old NYW&B station was closed and the trackage through the former station was made non-revenue, and it remains in part as a siding designated Track Y1A. Through service was operated by Seventh Avenue express trains between 5:30 AM and 8:30 PM. Between 8:30 and 1:15 shuttle trains operated from East 180th Street to Dyre Avenue, and in the early morning