diff --git a/src/main/java/cam72cam/immersiverailroading/entity/Locomotive.java b/src/main/java/cam72cam/immersiverailroading/entity/Locomotive.java
index ab18cf7b6..8877704b6 100644
--- a/src/main/java/cam72cam/immersiverailroading/entity/Locomotive.java
+++ b/src/main/java/cam72cam/immersiverailroading/entity/Locomotive.java
@@ -66,7 +66,7 @@ public abstract class Locomotive extends FreightTank {
 	@TagField("cogging")
 	private boolean cogging = false;
 
-	private boolean slipping = false;
+	protected boolean slipping = false;
 
 	/*
 	 * 
@@ -404,7 +404,7 @@ protected final double getStaticTractiveEffort(Speed speed) {
 				* 9.8 // M/S/S
 				* (slipping ? STEEL.kineticFriction(STEEL)/2 : STEEL.staticFriction(STEEL))
 				* slipCoefficient(speed)
-				/ getDefinition().factorOfAdhesion()
+				* (4/getDefinition().factorOfAdhesion()) // Physics are tuned to an adhesion factor of 4
 				* Config.ConfigBalance.tractionMultiplier;
 	}
 	
@@ -611,21 +611,16 @@ public void setBell(int newBell) {
 	}
 
 	public double slipCoefficient(Speed speed) {
-		double slipMult = 1.0;
+		double slipMult = 0.5; //TODO Assumes dirty rails.  Set this back to 1.0 and adjust physics coefficients
 		World world = getWorld();
 		if (world.isPrecipitating() && world.canSeeSky(getBlockPosition())) {
 			if (world.isRaining(getBlockPosition())) {
-				slipMult = 0.6;
+				slipMult *= 0.6;
 			}
 			if (world.isSnowing(getBlockPosition())) {
-				slipMult = 0.4;
+				slipMult *= 0.4;
 			}
 		}
-		// Wheel balance messing with friction
-		if (speed.metric() != 0) {
-			double balance = 1d/(Math.abs(speed.metric())+300) / (1d/300);
-			slipMult *= balance;
-		}
 		return slipMult;
 	}
 
diff --git a/src/main/java/cam72cam/immersiverailroading/entity/LocomotiveDiesel.java b/src/main/java/cam72cam/immersiverailroading/entity/LocomotiveDiesel.java
index 5b88dcd91..f334fb806 100644
--- a/src/main/java/cam72cam/immersiverailroading/entity/LocomotiveDiesel.java
+++ b/src/main/java/cam72cam/immersiverailroading/entity/LocomotiveDiesel.java
@@ -167,7 +167,7 @@ public double getAppliedTractiveEffort(Speed speed) {
 			if (getDefinition().hasDynamicTractionControl) {
 				double max = getStaticTractiveEffort(speed);
 				if (Math.abs(applied) > max) {
-					return Math.copySign(max, applied);
+					return Math.copySign(max, applied) * 0.95;
 				}
 
 			}
diff --git a/src/main/java/cam72cam/immersiverailroading/entity/LocomotiveSteam.java b/src/main/java/cam72cam/immersiverailroading/entity/LocomotiveSteam.java
index 4f2825388..9dff33b17 100644
--- a/src/main/java/cam72cam/immersiverailroading/entity/LocomotiveSteam.java
+++ b/src/main/java/cam72cam/immersiverailroading/entity/LocomotiveSteam.java
@@ -132,7 +132,25 @@ public double getTractiveEffortNewtons(Speed speed) {
 		return (getDefinition().cab_forward ? -1 : 1) * super.getTractiveEffortNewtons(speed);
 	}
 
-	@Override
+    @Override
+    public double slipCoefficient(Speed speed) {
+		double slipMult = super.slipCoefficient(speed);
+		// Wheel balance messing with friction
+		if (speed.metric() != 0) {
+			double balance = 1d/(Math.abs(speed.metric())+300) / (1d/300);
+			slipMult *= balance;
+		}
+
+		// TODO better approximation
+		// assume wheel diameter == 5m
+		double ratio = 0.35;
+		double hammer = ratio + (slipping ? 0 : Math.abs(Math.sin(Math.toRadians(360 * distanceTraveled / (5f * gauge.scale()/ 2))) * (1-ratio)));
+		slipMult *= hammer;
+
+		return slipMult;
+    }
+
+    @Override
 	protected double simulateWheelSlip() {
 		return (getDefinition().cab_forward ? -1 : 1) * super.simulateWheelSlip();
 	}