|Builder:||Brush / BR Crewe|
|Motor:||Sulzer 12LDA28-C diesel|
|Power:||2, 580 hp (1, 920 kW)|
The Class 47 was built to allow British Railways to finally withdraw steam traction on mainline services by 1968 and became the definitive second generation diesel locomotive for BR.
Originally they were a follow-on from the Class 45/46 Peaks and indeed the first twenty Class 47s replaced the last twenty Class 46s on order  with some of the equipment used (and in subsequent locomotives) was chosen because it was left over from the "Peak" production. The Class 47 had an uprated version of the Sulzer 12LDA28 powerplant but with a flat front as mandated by British Rail and took advantage of improvements in technology especially in terms of weight savings to be a Co-Co not a 1Co-Co1.
There were some teething problems as might be expected with such a big class, the Sulzer diesels needed to be derated to 2, 580hp to reduce wear and tear on the engine, but the Class 47 soon became the mainstay of heavy duty services. Five locomotives were fitted with the Sulzer V12 12LVA24 engine and classified as Class 48 though were later converted back into "normal" Class 47s.
|47/0||Original with train steam heating boilers|
|47/3||Dedicated freight locos with no train heating|
|47/4||Fitted with electric train heating|
|47/6||Single loco fitted with Rushton 16RK3CT engine testing for later Class 56|
|47/7||Fitted for push-pull services|
|47/8||Fitted with extra fuel tanks|
|47/9||47/6 loco later fitted with engine to test for Class 58|
Surviving Class 47s are still used on a variety of services such as charters, spot-hires and engineering services. Over thirty have been preserved to date many in working order. One Class 47 has even worked charters in Hungary. When the class was being built in the 1960s few would have suspected that might happen! 
|47 580 at Crewe|
|47 712 at Kidderminster Town|
|ROG 47 813 at Derby|
|47 773 at Tyseley|
|West Coast 47 237 at Tyseley|
|GBRf 47 749 at Kidderminster Town|
 Colin J Marsden, Traction Recognition (Ian Allan, 2011) p. 40
 Brian Haresnape, Production Diesel-Electrics Types 4 and 5 (2nd Edition) (Ian Allan, 1984) p. 52
 "47 375 named Falcon", Railways Illustrated No.166 (December 2016) p. 10