At that early stage this was a concept vehicle .
In time the DM&EE applied the new knowledge to existing practice in the design of the High Speed Train ( HST ) , the later prototype concept vehicle     and other high - speed vehicles .
At that early stage this was a concept vehicle , and in time the DM&EE applied the new knowledge to existing practice in the design of the High Speed Train ( HST ) , the later prototype APT - P and other high - speed vehicles .