(a) 
         Except as provided in paragraphs (b) and (c) of this section, cylinders containing Class 2 (gases) materials being transported in a rail car must be:
     
    
        
        (1) 
         Securely lashed in an upright position so as to prevent their overturning;
     
    
        
        (2) 
         Loaded into racks securely attached to the car;
     
    
        
        (3) 
         Packed in boxes or crates of such dimensions as to prevent their overturning; or
     
    
        
        (4) 
         Loaded in a horizontal position.
     
    
        
        (b) 
         Specification DOT-4L ( § 178.57 of this subchapter) cylinders being transported in a rail car must be loaded in an upright position and be securely braced.
     
    
        
        (c) 
         Cylinders containing Class 2 (gases) materials may be transported in stock cars, gondola cars and flat  cars. However, they may not be transported in hopper bottom cars.
     
    [Amdt. 174-26, 41 FR 16092, Apr. 15, 1976, as amended by Amdt. 174-26A, 41 FR 40685, Sept. 20, 1976; Amdt. 174-32, 43 FR 48644, Oct. 19, 1978; Amdt. 174-68, 55 FR 52682, Dec. 21, 1990]