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jruptlen of tho operation of trains, engines end cars over said tracks, or danger to person# and property! and provided further that no tools, implements or other materials shall at any time be placed upon said railroad tracks or so near thereto as to endanger |l trains, engines or cere, or persons thereon, operating upon said tracks. Kxcept In the eaee of emergency the Second Party, its suc­cessors and assigns, shall not perform or cause to be performed any 'eerie upon said easement strip in the vicinity of said railroad tracks and appurtenant facilities until after twenty-four <2*0 hours1 notice to the First Parties, their aueceesors and assigns! and in the case of emergency* immediate notice of such work shall j jj ns given to the agents or employees of the First Parties* their | successors and assigns* who can be found nearost to the point of jjwork. ho existing plpo line maintained by the Second Party, its successors and assigns* along said easement atrip shall be raised ; above its present level, end the top of ell new pipe lines or pips I lines replaced by them shall be placed at least four (£) fast below j j: the surface of the ground. This grant la subject and subordinate to the prior and continuing right and obligation of tho First Parties, their auccea- ; sore and Assigns* to maintain* operate and renew existing railroad tracks and appurtenant facilities in performance of their duty as s common carrier* and to construct additional railroad tracks and appurtenant facilitiaa upon* under, over, along and across the easement strip! and the Second Party, its successor* and assigns, 3.