RK 215
The RK 215 is a line of diesel engines built by MAN (previously Ruston). The RK 215 series  is a large four-stroke diesel engine that has an 11-liter displacement per cylinder. RK215 diesel engines have also been manufactured in Iran by DESA diesel,

Applications

Twelve- and sixteen-cylinder versions have been used in main line diesel electric locomotives, including  Alstom's LDE 3200 locomotive for Syria and M9 for Sri Lanka (12-cylinder), and the AD43C for Iran as well as the KTM Class 29 for Malaysia (16-cylinder). Like most MAN engines, the RK 215 is also sold for stationary and marine use. It is available in I-6 V-8, V-12 and V-16
RK215 engine during the introduction as AD43 locomotive application started in Iranian railway has received many modifications. References 

Diesel locomotive engines