The AD43C is a type of mainline 6 axle Co'Co' diesel locomotive designed by Alstom and used by the Islamic Republic of Iran Railways (RAI).

[citation needed] Alstom designated the vehicle with product code Prima DE 43 C AC.

[4] The first 20 units were to be manufactured at Alstom's factory in Belfort, France, the remainder at Wagon Pars in Iran.

[3][note 1] After production of an initial batch by Ruston the remaining engines were to be built by DESA in Iran under a technology transfer agreement.

[5] The locomotives are a 6-axle Co'Co' twin cab design, incorporating a RK 215 engine with a power at rail of 2,880 kW (3,860 hp).