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raptIon of the operation of train*, engine* and ear* over M i d traeks, or danger to persona and property) and provided further that no tool*, implement* or other materials shall at any time be placed upon eald railroad track* or so near thereto as to endanger trains, engine* or car*, or persons thereon, operating upon said track*. Except In the case of emergency the Second Party, its suc­cessor* and assign*, shall not perform or cause to be performed any work upon said easement strip In the vicinity of said railroad tracks and appurtenant facilities until after twenty-four (24) hours' notice to the First Parties, their successors and assigns) and in the case of emergency, Immediate notice of such work shall be given to the agents or employees of the First Parties, their successors and assigns, who can be found nearest to the point of work, ho existing pipe line maintained by the Second Party, lta successors and assigns, along said easement atrip shall be raised above its present level, and the top of all new pipe lines or pipe lines replaced by them shall be placed at least four (4) feet below the surface of the ground. This grant Is subject and subordinate to the prior and continuing right and obligation of the First Parties, their succes­sors and Assigns, to maintain, operate and renew existing railroad track* and appurtenant facilities in performance of their duty a* a common carrier, and to construct additional railroad tracks and appurtenant facilities upon, under, over, along and across the easement strip) and the Second Party, it* successors and assigns, 3