British Rail mixed traffic type 4 diesel locos built between 1961 and 1967 at Brush, Loughborough and at Crewe Works. Numerically the most numerous BR mainline diesel at 512 examples, only surpassed by class 08 shunters. Originally numbered D1500 to D1999 and D1100 to D1111, TOPS renumbering brought some clarity. Class 47/0 (47001 to 47298) were nominally boilered examples. Class 47/3 (47301 to 47381) were non boilered freight locos. Class 47/4 (47401 to 47529) were ETH fitted, some with boilers too. Later conversions and renumberings saw these original number series extended and additional number series being created. Class 47/6 (47601) Originally 47046, converted as a test bed for the class 56 engine, later converted to 47901. Class 47/7 (47701 to 47717) were push and pull modified locos for Edinburgh to Glasgow services. Class 47/7 (47721 to 47793) were locos converted to work with Propelling Control Vehicles used on Royal Mail trains. Class 47/7 (47798 to 47799) were nominally reserved for Royal Train use. Class 47/8 (47801 to 47854) has extended fuel tanks and were allocated to Intercity Cross Country. Class 47/9 (47901) The former 47601, converted to 47901 as a testbed for the class 58 engine. Class 47/9 (47971 to 47976) and class 97 (97472, 97480, 97545, 97561) locos nominally allocated as departmental and test train locos. The majority of the class now withdrawn and scrapped, but some remain in service with smaller operators and a number are preserved.