diff --git a/DynObj.cpp b/DynObj.cpp
index a34b5c06..19a79059 100644
--- a/DynObj.cpp
+++ b/DynObj.cpp
@@ -6058,7 +6058,11 @@ void TDynamicObject::LoadMMediaFile( std::string const &TypeName, std::string co
 
                     m_powertrainsounds.rsEngageSlippery.m_frequencyfactor /= ( 1 + MoverParameters->nmax );
                 }
-                else if( token == "linebreakerclose:" ) {
+				else if (token == "retarder:") {
+					m_powertrainsounds.retarder.deserialize(parser, sound_type::single, sound_parameters::amplitude | sound_parameters::frequency);
+					m_powertrainsounds.retarder.owner(this);
+				}
+				else if( token == "linebreakerclose:" ) {
                     m_powertrainsounds.linebreaker_close.deserialize( parser, sound_type::single );
                     m_powertrainsounds.linebreaker_close.owner( this );
                 }
@@ -7359,7 +7363,7 @@ TDynamicObject::powertrain_sounds::position( glm::vec3 const Location ) {
         &inverter,
         &motor_relay, &dsbWejscie_na_bezoporow, &motor_parallel, &motor_shuntfield, &rsWentylator,
         &engine, &engine_ignition, &engine_shutdown, &engine_revving, &engine_turbo, &oil_pump, &fuel_pump, &water_pump, &water_heater, &radiator_fan, &radiator_fan_aux,
-        &transmission, &rsEngageSlippery
+        &transmission, &rsEngageSlippery, &retarder
     };
     for( auto sound : enginesounds ) {
         if( sound->offset() == nullvector ) {
@@ -7613,6 +7617,21 @@ TDynamicObject::powertrain_sounds::render( TMoverParameters const &Vehicle, doub
         rsEngageSlippery.stop();
     }
 
+	if (Vehicle.hydro_R) {
+		float speed = std::abs(Vehicle.hydro_R_Fill * Vehicle.hydro_R_n);
+
+		retarder
+			.pitch(retarder.m_frequencyoffset + speed * retarder.m_frequencyfactor)
+			.gain(retarder.m_amplitudeoffset + Vehicle.hydro_R_Fill * retarder.m_amplitudefactor);
+	
+		if (retarder.gain() > 0.01) {
+			retarder.play(sound_flags::exclusive | sound_flags::looping);
+		}
+		else {
+			retarder.stop();
+		}
+	}
+
     // motor sounds
     volume = 0.0;
     // generic traction motor sounds
diff --git a/DynObj.h b/DynObj.h
index c77288df..12d831b5 100644
--- a/DynObj.h
+++ b/DynObj.h
@@ -403,6 +403,7 @@ private:
         sound_source radiator_fan_aux { sound_placement::engine };
         sound_source transmission { sound_placement::engine };
         sound_source rsEngageSlippery { sound_placement::engine }; // moved from cab
+		sound_source retarder { sound_placement::engine };
 
         void position( glm::vec3 const Location );
         void render( TMoverParameters const &Vehicle, double const Deltatime );