List of British Rail power classifications

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

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

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

• 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

Locomotives classed as Type 3 produced between 1,500 bhp and 1,999 bhp. This rating is the equivalent of steam engines with a power rating of 5 (as seen on the LMS Diesel No. 10000 and 10001).

• Class 33/34
• Class 35
• Class 37

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

• Class 40
• Class 41
• Class 42
• Class 43 (Warship)
• Class 43 (HST)
• Class 44
• Class 45
• Class 46
• Class 47
• Class 48
• Class 50
• Class 52
• Class 53
• Class 57
• D0260 Lion (prototype)
• DP2 (prototype)

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

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

• List of types