These locomotives were renovated and remotorised with Kolomna 12 D 49 M engines , and other more minor improvements : A replacement engine for the 232 series was sought .
The engine was reaching its wear limit .
These locomotives were renovated and remotorised with Kolomna 12 D 49 M engines , and other more minor improvements : A replacement engine for the 232 series was sought because the engine was reaching its wear limit .