Original: A total of 512 Class 47s were built at Crewe Works and Brush's Falcon Works, Loughborough between 1962 and 1968, which made them the most numerous class of British mainline diesel locomotive.
Simplified: A total of 512 Class 47s were built at Crewe Works and Brushs Falcon Works, Loughborough between 1962 and 1968, which made them the most numerous class of British mainline diesel locomotive.