diff --git a/common/src/main/java/cn/zbx1425/mtrsteamloco/mixin/RailActionsMixin.java b/common/src/main/java/cn/zbx1425/mtrsteamloco/mixin/RailActionsMixin.java
index 7b8c2259..c731062b 100644
--- a/common/src/main/java/cn/zbx1425/mtrsteamloco/mixin/RailActionsMixin.java
+++ b/common/src/main/java/cn/zbx1425/mtrsteamloco/mixin/RailActionsMixin.java
@@ -4,6 +4,7 @@
 import mtr.data.RailwayData;
 import net.minecraft.core.BlockPos;
 import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.SlabBlock;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.block.state.properties.SlabType;
@@ -33,9 +34,9 @@ public abstract class RailActionsMixin {
 
     @Shadow @Final private Level world;
 
-    @Shadow private static BlockPos getHalfPos(BlockPos pos, boolean isTopHalf) { throw new AssertionError(); }
+    @Shadow private static BlockPos getHalfPos(BlockPos pos, boolean isTopHalf) { return null; }
 
-    @Shadow(remap = false) private static boolean canPlace(Level world, BlockPos pos) { throw new AssertionError(); }
+    @Shadow(remap = false) private static boolean canPlace(Level world, BlockPos pos) { return true; }
 
     @Shadow(remap = false) @Final private int radius;
 
@@ -46,24 +47,30 @@ public abstract class RailActionsMixin {
     @Overwrite(remap = false)
     private boolean createBridge() {
         return this.create(false, (editPos) -> {
-            BlockPos pos = RailwayData.newBlockPos(editPos);
-            boolean isTopHalf = editPos.y - Math.floor(editPos.y) >= 0.5;
-            BlockPos placePos;
+            double refY = editPos.y;
+            BlockPos pos = RailwayData.newBlockPos(editPos.x, refY, editPos.z);
+            boolean isTopHalf = refY - Math.floor(refY) >= 0.5;
+
+            BlockPos placePos, airPos;
             BlockState placeState;
-            boolean placeHalf;
             if (this.isSlab && isTopHalf) {
                 placePos = pos;
+                airPos = pos.above();
                 placeState = this.state.setValue(SlabBlock.TYPE, SlabType.BOTTOM);
-                placeHalf = false;
             } else {
                 placePos = pos.below();
-                placeState = this.isSlab ? this.state.setValue(SlabBlock.TYPE, SlabType.TOP) : this.state;
-                placeHalf = true;
+                airPos = pos;
+                placeState = this.isSlab ? this.state.setValue(SlabBlock.TYPE, SlabType.DOUBLE) : this.state;
+            }
+
+            if (!blacklistedPos.contains(placePos) && canPlace(world, placePos)) {
+                world.setBlockAndUpdate(placePos, placeState);
+                blacklistedPos.add(placePos);
             }
-            BlockPos halfPlacePos = getHalfPos(placePos, placeHalf);
-            if (!this.blacklistedPos.contains(halfPlacePos) && canPlace(this.world, placePos)) {
-                this.world.setBlockAndUpdate(placePos, placeState);
-                this.blacklistedPos.add(halfPlacePos);
+
+            if (!blacklistedPos.contains(airPos) && canPlace(world, airPos)) {
+                world.setBlockAndUpdate(airPos, Blocks.AIR.defaultBlockState());
+                blacklistedPos.add(airPos);
             }
         });
     }
@@ -75,7 +82,7 @@ private double redirectCreateAbs(double a) {
 
     @ModifyConstant(method = "create", constant = @Constant(doubleValue = 0.01), remap = false)
     private double modifyCreateInterval1(double original) {
-        return 0.1;
+        return 0.05;
     }
 
 }