37026 & 37081 at Oban. ©Jim
The Class 37 (aka English Electric Type 3) were produced as part of British Rail’s modernisation plan. They became a very familiar sight across the network, in particular forming the main motive power for InterCity services in East Anglia and Scotland and performed well on other secondary routes and regional services for many years. Despite being over 50 years old, the class are still in use to this day - with over 60 in active use on passenger, freight and departmental duties as well as 30 preserved examples.
(Information provided via Wikipedia)