class Vehicle
{
  float weight ; //in pounds
  String typeOffuel ; //electric petrol diesel
  int topSpeed ; //mph
}

class Train extends Vehicle
{
	int numberOfCarriages ;
}



public class Inheritance
{
	public static void main( String args[] )
	 {
       Train trainObject = new Train() ;
       //train has Vehicle's properties also
       trainObject.topSpeed = 90 ;
       Vehicle vehicleObject =  trainObject ;
       //A train object is also a vehicle object
	 }

}