Simplify the following text for a Grade 6 native English-speaking person.
Original: They were the first of a new design of diesel shunters based on the English Electric 6K diesel engine of 350 h.
Simplified: They were the first of a new design of diesel shunters based on the English Electric 6K diesel engine of 350 h. These were given LMS numbers 7080 â `` 7119 .