diff --git a/McZapkie/MOVER.h b/McZapkie/MOVER.h
index 2ef017ab..56cb6a3c 100644
--- a/McZapkie/MOVER.h
+++ b/McZapkie/MOVER.h
@@ -637,6 +637,7 @@ struct TTransmision
 	int NToothM = 0;
 	int NToothW = 0;
 	double Ratio = 1.0;
+	double Efficiency = 1.0;
 };
 
 enum class TCouplerType { NoCoupler, Articulated, Bare, Chain, Screw, Automatic };
diff --git a/McZapkie/Mover.cpp b/McZapkie/Mover.cpp
index e0f380b5..d9060ecc 100644
--- a/McZapkie/Mover.cpp
+++ b/McZapkie/Mover.cpp
@@ -5248,7 +5248,7 @@ double TMoverParameters::TractionForce( double dt ) {
                 Itot = Im;
             else
                 Itot = Im * RList[MainCtrlActualPos].Bn; // prad silnika * ilosc galezi
-            Mw = Mm * Transmision.Ratio;
+            Mw = Mm * Transmision.Ratio  * Transmision.Efficiency;
             Fw = Mw * 2.0 / WheelDiameter;
             Ft = Fw * NPoweredAxles; // sila trakcyjna
             break;
@@ -5256,9 +5256,9 @@ double TMoverParameters::TractionForce( double dt ) {
 
         case TEngineType::DieselEngine:
         {
-            Mw = dmoment * dtrans; // dmoment i dtrans policzone przy okazji enginerotation
+            Mw = dmoment * dtrans * Transmision.Efficiency; // dmoment i dtrans policzone przy okazji enginerotation
 			if ((hydro_R) && (hydro_R_Placement == 0))
-				Mw -= dizel_MomentumRetarder(nrot * Transmision.Ratio, dt) * Transmision.Ratio;
+				Mw -= dizel_MomentumRetarder(nrot * Transmision.Ratio, dt) * Transmision.Ratio * Transmision.Efficiency;
             Fw = Mw * 2.0 / WheelDiameter / NPoweredAxles;
             Ft = Fw * NPoweredAxles; // sila trakcyjna
             Ft = Ft * DirAbsolute; // ActiveDir*CabNo;
@@ -5826,7 +5826,7 @@ double TMoverParameters::TractionForce( double dt ) {
                 }
 
                 Mm = eimv[eimv_M] * DirAbsolute;
-                Mw = Mm * Transmision.Ratio;
+                Mw = Mm * Transmision.Ratio * Transmision.Efficiency;
                 Fw = Mw * 2.0 / WheelDiameter;
                 Ft = Fw * NPoweredAxles;
                 eimv[eimv_Fr] = DirAbsolute * Ft / 1000;
@@ -9878,6 +9878,7 @@ void TMoverParameters::LoadFIZ_Engine( std::string const &Input ) {
             Transmision.Ratio = static_cast<double>( Transmision.NToothW ) / Transmision.NToothM;
         else
             Transmision.Ratio = 1.0;
+		extract_value(Transmision.Efficiency, "TransEff", Input, "");
     }
 
     switch( EngineType ) {