(a) 
         Maintenance-of-way equipment (including self-propelled maintenance-of-way equipment) described in  § 215.3(c)(3) shall be stenciled, or marked—
     
    
        
        (1) 
         In clearly legible letters; and
     
    
        
        (2) 
         In accordance with paragraph (b) of this section.
     
    
        
        (b) 
         The letters “MW” must be—
     
    
        
        (1) 
         At least 2 inches high; and
     
    
        
        (2) 
         Placed on each side of the car.
     
    [44 FR 77340, Dec. 31, 1979, as amended at 45 FR 26711, Apr. 21, 1980]