List of British Rail power classifications

British Railways, later British Rail, used a list of power classifications in order to categorise its main line diesel locomotive fleet. This list depended on the power output of the locomotive, and classes are listed below. A common misconception is that the first digit of the class number shows the type. This is usually correct (e.g. a Class 47 is a Type 4) but occasionally incorrect (e.g. a Class 31 is a Type 2).

Contents 1 Type 1 2 Type 2 3 Type 3 4 Type 4 5 Type 5 6 References

Type 1

Locomotives classed as Type 1 were of 1,000bhp or below.

• Class 14
• Class 15
• Class 16
• Class 17
• Class 20
• Certain members of Class 21
• Certain members of Class 22

Type 2

Locomotives classed as Type 2 produced between 1,001bhp and 1,499bhp.

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

Type 3

Locomotives classed as Type 3 produced between 1,500bhp and 1,999bhp.

• Class 33
• Class 35
• Class 37

Type 4

Locomotives classed as Type 4 produced between 2,000bhp and 2,999bhp.

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

Type 5

Locomotives classed as Type 5 produced 3,000bhp or more.

• Class 55
• Class 56
• Class 57
• Class 58
• Class 59
• Class 60
• Class 66
• Class 67
• Class 70

References

• List of types