@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!super.equals(obj))
			return false;
		if (!(obj instanceof AbstractFreightCarriage))
			return false;
		AbstractFreightCarriage other = (AbstractFreightCarriage) obj;
		if (curCapacity != other.curCapacity)
			return false;
		if (maxCapacity != other.maxCapacity)
			return false;
		return true;
	}