74.4-B2)    Crossings: Unless electric railroad systems are protected by interlocking plant at grade crossings with interurban or other heavy or high speed railway systems, the trolley contact conductors shall be at the same elevation above their own tracks throughout the crossing and next adjoining spans and, in addition thereto, catenary construction shall be provided when crossing spans exceed 100 feet (see Appendix G, Figs. 62 and 63).  This rule is not intended to apply where pantograph collector or similar device is used.

74.4-B2)    Crossings: At Grade Crossing of Railroads: Unless electric railroad systems are protected by interlocking plant at grade crossings with interurban or other heavy or high speed railway systems, the trolley contact conductors shall be at the same elevation above their own tracks throughout the crossing and next adjoining spans. and, in addition thereto, In addition to the above, catenary construction shall be provided when crossing spans exceed 100 feet (see Appendix G, Figs. 62 and 63 74-2).  This rule is not intended to apply where pantograph collector or similar device is used.

74.4-B2)    At Grade Crossing of Railroads: Unless electric railroad systems are protected by interlocking plant at grade crossings with interurban or other heavy or high speed railway systems, the trolley contact conductors shall be at the same elevation above their own tracks throughout the crossing and next adjoining spans. In addition to the above, catenary construction shall be provided when crossing spans exceed 100 feet (see Fig 74-2).  This rule is not intended to apply where pantograph collector or similar device is used.