49 USC 20303 - Moving defective and insecure vehicles needing repairs

(a) General.— 
A vehicle that is equipped in compliance with this chapter whose equipment becomes defective or insecure nevertheless may be moved when necessary to make repairs, without a penalty being imposed under section 21302 of this title, from the place at which the defect or insecurity was first discovered to the nearest available place at which the repairs can be made
(1) on the railroad line on which the defect or insecurity was discovered; or
(2) at the option of a connecting railroad carrier, on the railroad line of the connecting carrier, if not farther than the place of repair described in clause (1) of this subsection.
(b) Use of Chains Instead of Drawbars.— 
A vehicle in a revenue train or in association with commercially-used vehicles may be moved under this section with chains instead of drawbars only when the vehicle contains livestock or perishable freight.

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(c) Liability.— 
The movement of a vehicle under this section is at the risk only of the railroad carrier doing the moving. This section does not relieve a carrier from liability in a proceeding to recover damages for death or injury of a railroad employee arising from the movement of a vehicle with equipment that is defective, insecure, or not maintained in compliance with this chapter.