Chapter IV : Railway material - Art. 19.
Art. 19. Railway material coming from the territory of neutral Powers, whether it be the property of the said Powers or of companies or private persons, and recognizable as such, shall not be requisitioned or utilized by a belligerent except where and to the extent that it is absolutely necessary. It shall be sent back as soon possible to the country of origin.
A neutral Power may likewise, in case of necessity, retain and utilize to an equal extent material coming from the territory of the belligerent Power.
Compensation shall be paid by one Party or the other in proportion to the material used, and to the period of usage.