The Pennsylvania Railroad invested in diesel locomotives from all major manufacturers until EMD finally "won out" in the first generation diesel wars.

What follows is a timeline of diesel locomotive purchases by brand.

Models in bold are represented in the author's collection.

 

  Alco Baldwin EMD Fairbanks Morse General
Electric
1937     SW    
1938          
1939          
1940          
1941     NW2    
1942          
1943   VO 660      
1944          
1945   VO 1000 SW1    
1946     E7    
1947 PA-1
S-1 
DR 12-8-3000
"Centipede"
F3 ERIE-Built  
1948 RS-1 DR 6-4-2000 "Passenger Shark"
DS 4-4-660
DS 4-4-1000
  H10-44 44 Ton
1949   DR 4-4-1500 "Shark"
DRS 4-4-1000
F7 H20-44  
1950 RS-2
S-2
DS 4-4-750 E8
SW7
CFA 16-4
"C-Liner"
 
1951 FA-1
FA-2
RS-3
S-3
S-4
RF16 "Shark"
S-12
RS-12
AS-616
RT-624
GP7
SW9
   
1952 RSD-5   FP7 H12-44
H16-44
 
1953     SD7    
1954          
1955     GP9    
1956 RS-11
RSD-7
RSD-15
  LWT12 H24-66 
"Trainmaster"
 
1957     SD9    
Last Steam Locomotives Retired
1958 RSD-12
T-6
  SW1200    
1959          
1960          
1961          
1962 RS-27       U25B
1963 C424   GP30    
1964 C425   GP35    
1965 C628   SD35   U25C
1966 C630   SD40
SD45
  U28C
1967         U30C
1968 C636       U33C