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i riiptlw of the operation of trains, anginas and ears ovar said tracks, or dsngar to parsons and proparty} and provldad further that no tools, implements or othar materials shall at any tima ba placed upon said railroad traoks or so naar thsrato as to andangar trains, anginas or ears, or parsons tharaon, operating upon said traeks. Except in the ease of emergency the Second forty, its sue* cessors and assigns, shall not porform or esusa to ba performed any work upon said easement atrip in the vicinity of said railroad tracks and appurtenant facilities until after twenty-four (2k) hours' notice to the first Forties, thslr successors and assigns} and in the case of emergsncy, immediate notice of auch work shall ||ba given to the agents or employses of the First Parties, thslr I; successors and assigns, who can ba found nearest to the point of work, No existing pipe line maintained by the Second Forty, its successors and assigns, along said easement strip 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 (k) feet below the surface of the ground. This grant is subject and subordinate to the prior and continuing right and obligation of the First Forties, their access* sors and Assigns, to maintain, operate and renew existing railroad || tracks and appurtenant facilities in performance of their duty as a common carrier, end to construct additional railroad tracks and appurtenant facilities upon, under, over, along and across the easement strip} and the Second Forty, its successors and assigns, 3.