York State Transit Commission announced that it had reached an agreement with the IRT to increase service on its lines by 8,000,000 car miles a year–the greatest increase since 1922. As part of the changes, on January 30, all 242nd Street trains started running to New Lots Avenue. This change eliminated the splitting of trains at Brooklyn Museum, with the first half going to New Lots Avenue and the second half to Flatbush Avenue. In addition, the span of rush hour service on both Broadway–Seventh Avenue locals and expresses was increased. On January 25, 1931, the start time for southbound split train operation was changed from 1 p.m. to 9 a.m. passing Franklin Avenue in order to increase the frequency of service to Flatbush Avenue and New Lots Avenue from every sixteen minutes to every eight minutes. As of 1934, all express 1 trains were running from 242nd Street to New Lots Avenue weekdays and Saturdays during the day, alternating between New Lots and Flatbush Avenues evenings and Sunday afternoons, and were split at Brooklyn Museum on Sunday morning with the first half going to New Lots Avenue and the second half to Flatbush Avenue. All local 1 trains ran from 137th Street (extended to Dyckman Street during rush hours) to South Ferry days and evenings, and 242nd Street to either New Lots or Flatbush Avenues during late nights (from midnight to 5:30 a.m.). On September 5, 1937, the practice of splitting Sunday morning trains at Brooklyn Museum was discontinued, with the alternate trains going to New Lots Avenue or Flatbush Avenue. Trains were cut from being 10-car trains to 7-car trains. On July 1, 1938, all evening and Sunday trains were rerouted to New Lots Avenue. By 1945, all local 1 trains were cut back from Dyckman Street to 137th Street during peak periods. Beginning on May 10, 1946, all 1 trains in Brooklyn ran express during late nights, with service running every twelve minutes. Previously all 1 trains ran local from 12:30 to 5:30 am and they alternated between Flatbush and New Lots Avenues. On December 20, 1946, all late night trains were routed to Flatbush Avenue, while Sunday service still alternated between Flatbush and New Lots Avenues. The IRT routes were given numbered designations with the introduction of "R-type" rolling stock, which contained rollsigns with numbered designations for each service. The first such fleet, the R12, was