Input (grade 12): 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.
Output (grade 12): The British Rail Class 47 (Originally Brush Type 4) is a class of British railway diesel-electric locomotive that was developed in the 1960s by Brush Traction.