Demand reduced throttle by power supply

Author: cesarBLG

Source/Orts.Simulation/Common/Scripting/PowerSupply/LocomotivePowerSupply.cs

@@ -151,6 +151,21 @@ protected float MaxThrottlePercent
             }
         }
 
+        /// <summary>
+        /// Reduction of throttle percent enforced by power supply
+        /// </summary>
+        protected float ThrottleReductionPercent
+        {
+            get
+            {
+                return LpsHost.ThrottleReductionPercent;
+            }
+            set
+            {
+                LpsHost.ThrottleReductionPercent = Math.Max(Math.Min(value, 100), 0);
+            }
+        }
+
         /// <summary>
         /// Current throttle percentage
         /// </summary>

Source/Orts.Simulation/Simulation/RollingStocks/SubSystems/PowerSupplies/ILocomotivePowerSupply.cs

@@ -35,6 +35,7 @@ public interface ILocomotivePowerSupply : IPowerSupply
         float PowerSupplyDynamicBrakePercent { get; set; }
         float MaximumDynamicBrakePowerW { get; set; }
         float MaxThrottlePercent { get; set; }
+        float ThrottleReductionPercent { get; set; }
 
         PowerSupplyState AuxiliaryPowerSupplyState { get; set; }
         bool AuxiliaryPowerSupplyOn { get; }

Source/Orts.Simulation/Simulation/RollingStocks/SubSystems/PowerSupplies/LocomotivePowerSupply.cs

@@ -53,6 +53,7 @@ public abstract class ScriptedLocomotivePowerSupply : ILocomotivePowerSupply
         public float PowerSupplyDynamicBrakePercent { get; set; } = -1;
         public float MaximumDynamicBrakePowerW { get; set; } = 0;
         public float MaxThrottlePercent { get; set; } = 100;
+        public float ThrottleReductionPercent { get; set; } = 0;
 
         public PowerSupplyState AuxiliaryPowerSupplyState { get; set; } = PowerSupplyState.PowerOff;
         public bool AuxiliaryPowerSupplyOn => AuxiliaryPowerSupplyState == PowerSupplyState.PowerOn;

Source/Orts.Simulation/Simulation/RollingStocks/SubSystems/PowerSupplies/SteamPowerSupply.cs

@@ -58,6 +58,7 @@ public bool DynamicBrakeAvailable
         public float PowerSupplyDynamicBrakePercent { get; set; } = -1;
         public float MaximumDynamicBrakePowerW { get; set; } = 0;
         public float MaxThrottlePercent { get; set; } = 100;
+        public float ThrottleReductionPercent { get; set; } = 0;
 
         public PowerSupplyState AuxiliaryPowerSupplyState
         {

Source/Orts.Simulation/Simulation/RollingStocks/TrainCar.cs

@@ -458,6 +458,7 @@ public float ThrottlePercent
                 }
                 if (this is MSTSLocomotive loco)
                 {
+                    if (loco.LocomotivePowerSupply.ThrottleReductionPercent > 0) percent *= 1-loco.LocomotivePowerSupply.ThrottleReductionPercent/100;
                     if (loco.LocomotivePowerSupply.MaxThrottlePercent < percent) percent = Math.Max(loco.LocomotivePowerSupply.MaxThrottlePercent, 0);
                 }
                 return percent;