230.70—Safe condition.
        
        (a) Pre-departure inspection.
         At the beginning of each day the locomotive is used, the steam locomotive operator shall ensure that:
    
    
    
        
        (2) 
         The air compressor or compressors are in condition to provide an ample supply of air for the locomotive service intended;
    
    
    
    
    
        
        (b) Brake pipe valve required.
         Each steam locomotive shall have a brake pipe valve attached to the front of the tender, the rear of the back cab wall, or adjacent to the exit of a vestibuled cab. The words “Emergency Brake Valve” shall be clearly displayed near the valve.