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lof said railroad operating facilities for the purpose of avoiding 2interruption of the operation of trains, engines and cars over said 3 tracks or danger to persons and property, and provided further that 4no tools, implements or other materials shall at any time be placed gupon said railroad tracks or so near thereto as to endanger trains, gengines and cars or persons thereon operating upon said tracks. Ex- 7cept in case of emergency the District, its successors and assigns, gshall not perform or cause to be performed any work upon said ease-gmsnt strips in the vicinity of said railroad tracks and appurtenant ^facilities until after 2I4 hours’ notice to Grantors, their success lisors and assigns, and in the case of emergency, immediate notice of 12 such work shall be given to the agents or employees of the Grant- 13 ors, their successors and assigns, who can be found nearest to the 14Point of work. No existing pipe line maintained by Grantee, its 158uccessors and assigns, along said easement strips shall be raised 10above its present level, and all new pipe lines or pipe lines re­placed by them shall be placed at least four (k) feet below the Igsurface of the ground. 19 The casements herein granted are subject and subordinate 20to the right of the Grantors, their successors and assigns, to main- 21 tain, operate and renew existing railroad tracks and appurtenant 22facllities, and to construct additional railroad tracks and appur- 23tenant facilities upon, under, over, along and across the easement 24strips; and Grantee, its successors and assigns, shall not be en- 25titied to remove or disturb said railroad tracks and appurtenant fa- 26cilities for the purpose of constructing, maintaining, operating, 27 EXHPaIgBeI T 2.nFH 28