text: On 19 August 2021, 66754 was hauling a freight train which collided with a tractor on a level crossing between  and  in Cambridgeshire. The locomotive and three wagons were derailed.
  On 24 December 2021, 66779, working a train from Hams Hall (near Birmingham) to London Gateway derailed on the down Thames Haven line while on the approach to the port near to Stanford-le-Hope in Essex.
  On 5 July 2022, 66729 was hauling a freight train that passed a signal at danger and ran into the rear of another freight train near Loversall Carr Jn, Doncaster.
  On 19 October 2022 66739 hauled a loaded cement train from Clitheroe Castle Cement Gb to Carlisle N.Y. before eight wagons derailed at Petteril Bridge Junction with one crashing into the River Petteril and one half way down the embankment.
  On 5 April 2024, 66776 passed a red signal and was derailed at West Ealing.
  Sub-classes
  Minor differences between different orders, and different operating companies have resulted in a number of subclasses being defined.
  Names
  Models
  In 2006 Hornby Railways launched its first version of the BR Class 66 in OO gauge range in a variety of liveries.
  Since 2019 Hattons have offered a variety of paint schemes for their class 66 model in OO gauge.