A total of 98 Class 33s were built by the Birmingham Railway Carriage and Wagon Company ( BRCW ) and were known as `` Cromptons '' after the Crompton Parkinson electrical equipment installed in them .
A total of 98 class 33s were built by the Birmingham Railway Carriage and Wagon Company , and they were called `` Cromptons '' after the Crompton Parkinson electrical equipment installed in them .