They were fitted with the Sulzer 12LDA28C twin-bank twelve-cylinder unit producing - though this was later derated to to improve reliability - and have been used on both passenger and freight trains on LOCATION@1 's railways for over NUMBER@1 years .

They were fitted with the Sulzer 12LDA28C twin-bank twelve-cylinder unit producing -LRB- later derated to 2580bhp to improve reliability -RRB- , and have been used on both passenger and freight trains on LOCATION@1 's railways for over NUMBER@1 years .
