Manual of recommended practice for railway engineering and maintenance of way (1905)
American Railway Engineering and Maintenance-of-Way Association · Chicago, Ill. : The Association · leaf 55
STANDARD DRILLING FOR SIX-HOLE SPLICE. … STANDARD DRILLING FOR FOUR-HOLE SPLICE. *FROG BLOCKING. RECOMMENDED PRACTICE. That the heel of all frogs be made with a steel filler block, to fitthe section of rail, securely bolted in with the outer end of filler planedoff ^-in. below top of rail to act as a riser for the outer edge of…
Railroad engineering · Railroads
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
