The performance of steam locomotives can be improved by raising the steam pressure. Many countries experimented with high pressure steam locomotives from the late 20ies into the 50ies, but no satisfactory design was ever found.

 

 

   Class Wheel Arrangement km/h hpi Year   
  
Canada: Candian Pacific
  
Info 8000 1'E2' h3v      1931
  
Colombia
  
    (A'Bo)(BoA') h12v     1933  
  
France: PLM
  
Info 241B 2'D1' h4v 110 km/h 2530 hp 1930
  
France: SNCF
  
Info 230E93 2'C 120 km/h 1800 hp 1938
Info 232P1 2'Co2' h18 140 km/h   1943
  
Germany: DRG
  
Info H02 2'C1' h3v 110 km/h   1929
Info H17 2'C h3v 120 km/h 2000 hp 1925
  
Germany: DR
  
Info H45 1'E1' h3v 100 km/h   1951
  
Germany: LBE
  
Info IDM-22
-> DRG Kd4994		 B h2v 60 km/h 122 hp 1935
  
Switzerland: SBB
  
Info Eb3/5 1'C1' h3t 80 km/h 1496 hp 1927
  
UK: L.M.S.
  
Info 7192 B h4v     1934
Info Fury 2'C h3v 145 km/h   1929
  
UK: L.N.E.R.
  
Info W-1 2'C1'1' h4v 140 km/h   1930
  
USA: Delaware & Hudson Railroad Comp.
  
Info E-7 1400
Horatio Allen		 1'D h2v     1924
Info E-7 1401
John B. Jervis		 1'D h2v     1925
  E-7 1402
James Archbald		 1'D h2v     1930  
Info E-7 1403
L. F. Loree		 2'D h4v     1931
  
USA: New York Central
  
Info HS-1a 2'D2' h3v     1931
  
USA: Norfolk & Western
  
Info TE-1
Jawn Henry		 (Co'Co')(Co'Co') hTurb 97 km/h 4500 hp 1955
  
USA: Union Pacific
  
Info UP-1, -2 (2'Co)(Co2') hTurb 200 km/h 5000 hp 1939