Got 1920-1930 info from the PRR Chronology

Akron Division

Allegheny Division

• 1930/5/1 split between Conemaugh Division (south of Kiski Junction), Buffalo Division (north of Kiski Junction) and Renovo Division (Low Grade Line)

Amboy Division

Atlantic Division

• 1920/4/7? formed (West Jersey and Seashore Railroad)
• 1930/7/1 absorbed Camden Terminal Division
• 1930/7/1 became part of Philadelphia Terminal General Division

Baltimore Division

Buffalo Division

• 1930/5/1 got Allegheny Division north of Kiski Junction

Camden Terminal Division

• 1928/10/1 went to Philadelphia Terminal General Division
• 1930/4/16 got Camden-Bay Head and branches from Trenton Division
• 1930/7/1 merged into Atlantic Division

Cincinnati Division

• 1922/10/5 added Cincinnati, Lebanon and Northern Railway
• 1924/1/16 absorbed Zanesville Division
• 1928/5/1 got part of Richmond Division
• 1928/5/1 got Trinway-Morrow to Panhandle Division

Cleveland Division

• 1928/3 renamed from Cleveland and Pittsburgh Division

Cleveland and Pittsburgh Division

• 1920/5/1 south of Yellow Creek went to new Wheeling Division
• 1924/1/16 got part of Marietta Division
• 1928/3 renamed Cleveland Division

Columbus Division

• 1928/5/1 got part of Richmond Division

Conemaugh Division

• 1930/5/1 got Allegheny Division south of Kiski Junction

Cresson Division

• 1930/1/1 moved from Eastern Pennsylvania General Division to Western Pennsylvania General Division
• 1930/1/1 gave Bellwood-Irvona to Middle Division
• 1930/4/16 merged into Pittsburgh Division

Cumberland Valley Division

Delaware Division

• 1928/5/1 got Baltimore, Chesapeake and Atlantic Railway
• 1930/4/16 gave Wilmington-Mt. Pleasant to Maryland Division
• 1930/4/16 merged into Delmarva Division

Delmarva Division

• 1930/4/16 formed from Norfolk Division and Delaware Division minus Wilmington-Mt. Pleasant

Eastern Division

• 1924/1/16 got Marietta Division Coshecton-Loudensville
• 1930/6/1 got Crestline-Mansfield from Fort Wayne Division

Elmira Division

Erie and Ashtabula Division

Fort Wayne Division

• 1920/3/1 from part of Western Division (PFW&C)
• 1921/3/16 absorbed Mansfield Division
• 1930/6/1 gave Crestline-Mansfield to Eastern Division

Grand Rapids Disivion

• 1920/3/1 from Southern Division (GR&I)
• 1924/1/16 absorbed Mackinaw Division
• 1924/1/16 gave south of Fort Wayne to Richmond Division

Indianapolis Division

• 1924/1/16 got part of South Bend Division
• 1925/5/1 got most of Louisville Division

Juniata Division

• 1921/3/1 merged into Middle Division

Logansport Division

• 1924/1/16 got part of South Bend Division (South Bend-Logansport)

Long Island Rail Road

• 1928/10/1 PRR began operating; combined with New Jersey General Division to form New York Zone

Louisville Division

• 1925/5/1 merged into Indianapolis Division except Terre Haute-Frankfort (St. Louis Division)

Mackinaw Division

• 1920/3/1 from Northern Division (GR&I)
• 1924/1/16 merged into Grand Rapids Division

Manhattan Division

• 1921/3/15 merged into New York Division

Mansfield Division

• 1920/3/1 from part of Western Division (PFW&C)
• 1921/3/16 merged into Fort Wayne Division

Marietta Division

• 1924/1/16 divided between Eastern Division (Coshecton-Loudensville) and Cleveland and Pittsburgh Division

Maryland Division

• 1928/10/1 gave Philadelphia-West Chester to Philadelphia Terminal Division?

Middle Division

• 1921/3/1 absorbed Juniata Division
• 1929/5/1 absorbed Tyrone Division
• 1930/1/1 got Bellwood-Irvona from Cresson Division

Monongahela Division

• 1920/3/1 got Greensburg-Uniontown from Pittsburgh Division

New York Division

• 1921/3/15 absorbed Manhattan Division
• 1930/4/16 got South Amboy-Camden, Belvidere Delaware Railroad and Freehold and Jamesburg Agricultural Railroad from Trenton Division

Norfolk Division

• 1920/4/13? formed (New York, Philadelphia and Norfolk Railroad), operations began 1922/11/1
• 1930/4/16 merged into Delaware Division

Panhandle Division

• 1920/3/1 from Pittsburgh Division (PCC&StL)
• 1920/5/1 gave Wheeling Junction-Wheeling to Wheeling Division
• 1928/5/1 got Trinway-Morrow from Cincinnati Division
• 1928/5/1 got Lawton-Zanesville from Wheeling Division

Peoria Division

• 1923/3/1 merged into St. Louis Division

Philadelphia Division

• 1925/1/16 gave 52nd Street-Green Tree to Philadelphia Terminal Division

Philadelphia Terminal Division

• 1925/1/16 got 52nd Street-Green Tree from Philadelphia Division

Pittsburgh Division

• 1920/3/1 gave Greensburg-Uniontown to Monongahela Division
• 1921/12/31 got Jamison Branch No. 2
• 1930/4/16 absorbed Cresson Division

Pittsburgh Terminal Division

• 1920/3/1 formed
• 1921/3/1 lines returned to original divisions, but South Side-Dravosburg goes to Pittsburgh Division
• 1925/6/1 no longer a general division, just a regular division
• 1926/6/1 back to a general division
• 1928/10/1 went to Philadelphia Terminal General Division (along with Camden Terminal Division)
• 1928/10/1 got Philadelphia-West Chester from Maryland Division?

Renovo Division

• 1920/3/1 into Northern Grand Division
• 1930/5/1 got Allegheny Division Low Grade Line

Richmond Division

• 1924/1/16 got south of Fort Wayne from Grand Rapids Division
• 1928/5/1 split between Cincinnati Division and Columbus Division

St. Louis Division

• 1923/3/1 absorbed Peoria Division
• 1925/5/1 got Terre Haute-Frankfort from Louisville Division
• 1928/5/31 St. Louis Connecting Railroad opened

Schuylkill Division

South Bend Division

• 1920/3/1 from Michigan Division of St. Louis System
• 1924/1/16 split between Logansport Division (South Bend-Logansport) and Indianapolis Division

Toledo Division

Trenton Division

• 1930/4/16 split between New York Division (South Amboy-Camden, Belvidere Delaware Railroad and Freehold and Jamesburg Agricultural Railroad) and Camden Terminal Division (Camden-Bay Head and branches)

Tyrone Division

• 1929/5/1 merged into Middle Division

Wheeling Division

• 1920/5/1 formed from Wheeling Terminal Division, Ohio River and Western Railway, Cleveland and Pittsburgh Division south of Yellow Creek, other lines, got Wheeling Junction-Wheeling from Panhandle Division
• 1928/5/1 gave Lawton-Zanesville to Panhandle Division

Wheeling Terminal Division

• 1920/3/1 formed (Wheeling Terminal Railway)

Williamsport Division

Zanesville Division

• 1924/1/16 merged into Cincinnati Division