List of British Rail power classifications

The British Transport Commission, later British Railways, used engine power output to categorise its new main line diesel locomotive fleet following the 1955 modernisation plan. These categories were from Type 1 to Type 5 and are listed below.

Type 1

Up to 1,000 bhp

• Class 14
• Class 15
• Class 16
• Class 17
• Class 20

Type 2

From 1,001 bhp to 1,499 bhp

• Class 21
• Class 22
• Class 23
• Class 24
• Class 25
• Class 26
• Class 27
• Class 28
• Class 29
• Class 30/31

Type 3

From 1,500 bhp to 1,999 bhp

• Class 33
• Class 35
• Class 37

Type 4

From 2,000 bhp to 2,999 bhp

• Class 40
• Class 41
• Class 42
• Class 43
• Class 44
• Class 45
• Class 46
• Class 47
• Class 48
• Class 50
• Class 52
• Class 53
• Class 57

Type 5

From 3,000 bhp

• Class 55
• Class 56
• Class 58
• Class 59
• Class 60
• Class 66
• Class 67
• Class 68
• Class 70

References

• List of types