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1 2 5 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 of said railroad operating facilities for the purpose of avoiding interruption of the operation of trains, engines and cars over said tracks or danger to persons 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 trains, engines and cars or persons thereon operating upon said tracks. Ex­cept in case of emergency the District, its successors and assigns, shall not perform or cause to be performed any work upon said ease­ment strips in the vicinity of said railroad tracks.and appurtenant facilities until after 24 hours’ notice to Grantors, 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 Grant­ors, their successors and assigns, who can be found nearest to the point of work. No existing pipe line maintained by Grantee, its successors and assigns, along said easement strips shall be raised jO. above its present level, and a11 new pipe lines or pipe lines re­placed by them shall be placed at least four (4) feet below the surface of the,ground. The easements herein granted are subject and subordinate to the right of the Grantors, their successors and assigns,to main­tain, operate and renew existing railroad tracks and appurtenant facilities, and.to construct additional railroad tracks and appur­tenant facilities upon, under, over, along and across the easement strips; and Grantee, its successors and assigns, shall not be en­titled to remove or disturb.said railroad tracks and appurtenant fa­cilities for the purpose of constructing, maintaining, operating, EXHIBIT %** Page.2.