Service was rerouted east alongside Boston Road and 174th Street to finish at Parkchester, and repair rerouted via Edward L. Grant Highway west of 170th Street. Authentic western terminus was at Andrews Avenue-West 175th Street. Authentic north-japanese terminus was at Mundy Lane-Pitman Avenue (at NYC-Mount Vernon line). Service originally ran with the Bx1 at Sedgwick Avenue and Heath Avenue until June 1996, when it was rerouted to serve Bailey Avenue.

Service was initially rerouted from Bruckner Boulevard to Crosby Avenue in Pelham Bay to substitute Bx8 service by way of the area on June 27, 2010, resulting from funds-related reductions. Service originally ran all of Co-op City from July 1974 to June 2010, when part 1-2-three service was cut up off into Bx38 because of budget-associated service reductions. Cut up branched service to Fordham Middle originally ran all instances except nights until September 10, 2000, when alternating Bx28 service to Fordham Center (initially working weekdays and Saturdays only) changed it.

Introduced on January 2, 2011, to exchange portion of former Bx14 service between Country Membership and Westchester Sq.. New route launched on March 5, 1989, as the Bronx portion of the M100, which initially served Spuyten Duyvil (all occasions except nights) and Riverdale (late evenings and weekends solely). Hirshon, Nicholas (March 2, 2006). "BIZ Driven AWAY. BUS REROUTE HURTS Sales, SAY JAMAICA MART Owners". Goldman, Sam (December 13, 2006). "Community Board 6 Hears Of Traffic Pattern Changes: Residents Wary Of Rego Pk.

Mall Work". Stephen L. Meyers (2006). Lost Trolleys of Queens and Long Island. Golubski, Suzanne (July 14, 1983). "TA trains sight on buses". Golubski, Suzanne (July 14, 1983). "TA trains sights on buses". Bx15 Restricted service changed former Bx55 Restricted-Stop service between Fordham Plaza and The Hub on July 1, 2013, now not stopping at East 174th Road. Could 15, 1946. p. Began November 1, 1927 (northern portion) and June 15, 1934, by Bronx Coach (southern portion).