the black mesa rail network

src/main/java/com/hbm/entity/train/EntityRailCarBase.java

@@ -34,6 +34,16 @@ public abstract class EntityRailCarBase extends Entity {
 	@Override protected void entityInit() { }
 	@Override protected void readEntityFromNBT(NBTTagCompound nbt) { }
 	@Override protected void writeEntityToNBT(NBTTagCompound nbt) { }
+
+	@Override
+	public boolean canBePushed() {
+		return true;
+	}
+
+	@Override
+	public boolean canBeCollidedWith() {
+		return !this.isDead;
+	}
 	
 	@Override
 	public void onUpdate() {
@@ -67,10 +77,11 @@ public abstract class EntityRailCarBase extends Entity {
 				Vec3 frontPos = getRelPosAlongRail(anchor, this.getLengthSpan());
 				Vec3 backPos = getRelPosAlongRail(anchor, -this.getLengthSpan());
 
-				if(frontPos == null) this.derail();
-				if(backPos == null) this.derail();
-				
-				if(frontPos != null && backPos != null) this.rotationYaw = generateYaw(frontPos, backPos);
+				if(frontPos == null || backPos == null) {
+					this.derail();
+				} else {
+					this.rotationYaw = generateYaw(frontPos, backPos);
+				}
 			}
 		}
 	}

src/main/java/com/hbm/entity/train/EntityRailCarRidable.java

@@ -0,0 +1,43 @@
+package com.hbm.entity.train;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.util.Vec3;
+import net.minecraft.world.World;
+
+public abstract class EntityRailCarRidable extends EntityRailCarBase {
+	
+	public EntityRailCarRidable(World world) {
+		super(world);
+	}
+
+	@Override
+	public boolean interactFirst(EntityPlayer player) {
+		if(this.riddenByEntity != null && this.riddenByEntity instanceof EntityPlayer && this.riddenByEntity != player) {
+			return true;
+		} else {
+			if(!this.worldObj.isRemote) {
+				player.mountEntity(this);
+			}
+			return true;
+		}
+	}
+	
+	@Override
+	public void onUpdate() {
+		super.onUpdate();
+	}
+
+	@Override
+	public void updateRiderPosition() {
+		
+		Vec3 offset = getRiderSeatPosition();
+		offset.rotateAroundY(this.rotationYaw);
+		
+		if(this.riddenByEntity != null) {
+			this.riddenByEntity.setPosition(this.posX + offset.xCoord, this.posY + offset.yCoord, this.posZ + offset.zCoord);
+		}
+	}
+
+	/** Returns a Vec3 showing the relative position from the driver to the core */
+	public abstract Vec3 getRiderSeatPosition();
+}

src/main/java/com/hbm/entity/train/TrainCargoTram.java

@@ -0,0 +1,46 @@
+package com.hbm.entity.train;
+
+import com.hbm.blocks.rail.IRailNTM.TrackGauge;
+
+import net.minecraft.util.Vec3;
+import net.minecraft.world.World;
+
+public class TrainCargoTram extends EntityRailCarRidable {
+
+	/*
+	 * 
+	 *     _________
+	 *    | |       \          <--
+	 *    | |       |___
+	 *    | |       |  |                             |
+	 * _O\|_|_______|__|_____________________________|/O_
+	 * |____|                                      |____|
+	 *    \__________________________________________/
+	 *        '( + )'                      '( + )'
+	 * 
+	 */
+
+	public TrainCargoTram(World world) {
+		super(world);
+	}
+
+	@Override
+	public double getCurrentSpeed() {
+		return 0;
+	}
+
+	@Override
+	public TrackGauge getGauge() {
+		return TrackGauge.STANDARD;
+	}
+
+	@Override
+	public double getLengthSpan() {
+		return 2;
+	}
+
+	@Override
+	public Vec3 getRiderSeatPosition() {
+		return Vec3.createVectorHelper(1, 1, 0);
+	}
+}