diff --git a/src/main/java/com/simibubi/create/content/contraptions/relays/advanced/GantryShaftBlock.java b/src/main/java/com/simibubi/create/content/contraptions/relays/advanced/GantryShaftBlock.java
index 9592b9d02..2750d05ab 100644
--- a/src/main/java/com/simibubi/create/content/contraptions/relays/advanced/GantryShaftBlock.java
+++ b/src/main/java/com/simibubi/create/content/contraptions/relays/advanced/GantryShaftBlock.java
@@ -98,7 +98,7 @@ public class GantryShaftBlock extends DirectionalKineticBlock {
 			return state;
 		boolean connect = AllBlocks.GANTRY_SHAFT.has(neighbour) && neighbour.get(FACING) == facing;
 
-		Part part = state.get(PART);
+		Part part = state.get(PART), prevPart = part;
 		if (direction.getAxisDirection() == facing.getAxisDirection()) {
 			if (connect) {
 				if (part == Part.END)
@@ -125,6 +125,13 @@ public class GantryShaftBlock extends DirectionalKineticBlock {
 			}
 		}
 
+		if (!world.isRemote() && part == Part.MIDDLE && prevPart != Part.MIDDLE) {
+			TileEntity te = world.getTileEntity(pos);
+			if (te instanceof GantryShaftTileEntity) {
+				((GantryShaftTileEntity)te).checkAttachedCarriageBlocks(true);
+			}
+		}
+
 		return state.with(PART, part);
 	}
 
@@ -260,7 +267,7 @@ public class GantryShaftBlock extends DirectionalKineticBlock {
 		return super.areStatesKineticallyEquivalent(oldState, newState)
 			&& oldState.get(POWERED) == newState.get(POWERED);
 	}
-	
+
 	@Override
 	public float getParticleTargetRadius() {
 		return .35f;
@@ -270,7 +277,7 @@ public class GantryShaftBlock extends DirectionalKineticBlock {
 	public float getParticleInitialRadius() {
 		return .25f;
 	}
-	
+
 	@Override
 	public boolean allowsMovement(BlockState state, IBlockReader reader, BlockPos pos, PathType type) {
 		return false;
diff --git a/src/main/java/com/simibubi/create/content/contraptions/relays/advanced/GantryShaftTileEntity.java b/src/main/java/com/simibubi/create/content/contraptions/relays/advanced/GantryShaftTileEntity.java
index 681a01269..3b15e5992 100644
--- a/src/main/java/com/simibubi/create/content/contraptions/relays/advanced/GantryShaftTileEntity.java
+++ b/src/main/java/com/simibubi/create/content/contraptions/relays/advanced/GantryShaftTileEntity.java
@@ -19,15 +19,12 @@ public class GantryShaftTileEntity extends KineticTileEntity {
 		super(typeIn);
 	}
 
-	@Override
-	public void onSpeedChanged(float previousSpeed) {
-		super.onSpeedChanged(previousSpeed);
-
-		if (!canAssembleOn())
+	public void checkAttachedCarriageBlocks(boolean willBeMiddle) {
+		if (!canAssembleOn(willBeMiddle))
 			return;
 		for (Direction d : Iterate.directions) {
 			if (d.getAxis() == getBlockState().get(GantryShaftBlock.FACING)
-				.getAxis())
+					.getAxis())
 				continue;
 			BlockPos offset = pos.offset(d);
 			BlockState pinionState = world.getBlockState(offset);
@@ -39,7 +36,12 @@ public class GantryShaftTileEntity extends KineticTileEntity {
 			if (tileEntity instanceof GantryCarriageTileEntity)
 				((GantryCarriageTileEntity) tileEntity).queueAssembly();
 		}
+	}
 
+	@Override
+	public void onSpeedChanged(float previousSpeed) {
+		super.onSpeedChanged(previousSpeed);
+		checkAttachedCarriageBlocks(false);
 	}
 
 	@Override
@@ -73,6 +75,10 @@ public class GantryShaftTileEntity extends KineticTileEntity {
 	}
 
 	public boolean canAssembleOn() {
+		return canAssembleOn(false);
+	}
+
+	public boolean canAssembleOn(boolean willBeMiddle) {
 		BlockState blockState = getBlockState();
 		if (!AllBlocks.GANTRY_SHAFT.has(blockState))
 			return false;
@@ -80,6 +86,9 @@ public class GantryShaftTileEntity extends KineticTileEntity {
 			return false;
 		float speed = getPinionMovementSpeed();
 
+		if (willBeMiddle)
+			return speed != 0;
+
 		switch (blockState.get(GantryShaftBlock.PART)) {
 		case END:
 			return speed < 0;
@@ -99,7 +108,7 @@ public class GantryShaftTileEntity extends KineticTileEntity {
 			return 0;
 		return MathHelper.clamp(-getSpeed() / 512f, -.49f, .49f);
 	}
-	
+
 	@Override
 	protected boolean isNoisy() {
 		return false;