Simplify the following text for a Grade 11 native English-speaking person.
Original: The Class 67 locomotives are a class of Bo ` Bo ' diesel electric mainline locomotives which were built for the English , Welsh and Scottish Railway between 1999 to 2000 by Alstom at Meinfesa in Valencia , Spain with drive components ( engine and transmission ) from General Motors Diesel .
Simplified: The Class 67 locomotives were built from 1999 to 2000 by Alstom in Valencia , Spain under sub-contract from General Motors Diesel in Canada .