The British Rail Class 37 is a diesel-electric locomotive. Also known as the English Electric Type 3, the class 37 was ordered as part of the British Rail modernisation plan. They were numbered in two series, D6600–D6608 and D6700–D6999.

The Class 37 became a familiar sight on many parts of the British Rail network, in particular forming the main motive power for InterCity services in East Anglia and within Scotland. They also performed well on secondary and inter-regional services for many years. The Class 37s are known to some railway enthusiasts as “tractors”^,a nickname due to the agricultural sound of the diesel engine of the locomotive.

37219 leads 37116 on the 1Z71 Derby RTC to Derby RTC
37266 “Victorious” on the 6Z21 Toton North Yard to York Thrail dragging DR73118 Tamper
97303 returns from tyre turning on the 0Z37 Doncaster Roberts Road to Derby RTC
Sole surviving Mirrlees fitted class 37 37901 on its maiden test run 0R56 Leicester LIP to Leicester LIP via Sheffield
37116 leads the 3Z01 1025 Slateford Depot to Derby RTC Serco through Slitting Mills. DBSO 9714 is on the rear
37558 (37424) “Avro Vulcan XH558” and 37422 “Victorious” on the 0Z37 York Parcel Sidings to Crewe Wagon Shop.
37402 leads 37401 on the 3J51 York Thrall Europa to York Thrall Europa via Chesterfield
37884 on the 5R57 Castle Donington EMDC to Derby RTC
37608 on the 5R57 Castle Donnington EMDC to Derby RTC stock move.
37419 leads 37401 on the 3J51 York Thrail/York Thrail RHTT working round the Wolds coast through Clifton, York.
37884 Cepheus passes Kilnhurst on the 5M57 Doncaster Roberts Road to Derby RTC ferrying a pair of barrier coaches
37510 “Orion” leads the 1Z27 Derby to Barrow Hill Beer Festival charter round the old road through Beighton Junction.
37421 and inspection saloon 975025 Caroline passes Beighton Junction on the 5Z10 Doncaster West Yard to Derby RTC
37175 near Sawley LC on 0Z38 Nottingham Eastcroft to Derby RTC
D6817 (37521) drags 37604, 37609 and 37603 from Crewe Holding Sidings to Worksop Sorting Sidings for storage
37401 on the 5Z07 York Parcel Sidings to Derby RTC pulling 975025 “Caroline”
37610 passes Barow upon Trent on the 1Q46 0852 Derby RTC Serco to Derby RTC Serco test train
37612 leads 1Q46 0852 Derby RTC Serco to Derby RTC Serco through Barrow Upon Trent with 37610 on the rear.