The first unit to be re-engined was NUMBER@1 , a further NUMBER@2 machines were re-engined in NUMBER@3 at ORGANIZATION@1 , along with other modifications including the fitting of four-character headcode displays in the nose ends .

A further NUMBER@2 were re-engined in NUMBER@3 at ORGANIZATION@1 , with other changes made at the same time . This included the fitting of four-character headcode displays in the nose ends .
