A temporary trestle 100 ft. downstream from the bridge site permitted tracklaying to proceed .
A temporary trestle 100 ft. downstream from the bridge site facilitated erection of the bridge without interference to traffic and to other construction work north of the river .
A temporary trestle 100 ft. downstream from the bridge site permitted tracklaying to proceed and facilitated erection of the bridge without interference to traffic and to other construction work north of the river .