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File:Drilling starts with center drill.jpg All drilling operations should start with a center drill; this gives an accurate and clean starting(611 × 488 (50 KB)) - 13:29, 17 May 2013File:CIG Spring Meet 2018Apr MexicanHat RobertWillis.jpg Switching operations well underway at Mexican Hat on the Comanche & Indian Gap RR. The top of t(2,000 × 1,126 (1.06 MB)) - 14:57, 14 May 2018File:RaccoonGulchLines IndependentJournal 19610318 2.jpg ...ht are trees around which the end of the line curves and reverses itself. Operations are done at slow speed with real railroad safety precautions and it's a big(2,856 × 3,256 (2.22 MB)) - 00:32, 9 January 2016File:C Purinton and A Wegner facing away right at NELS Oct 1939.jpg Carl Purinton & Art Wegner (backs to camera) observing operations at NELS Danvers, MA, October 1939. From Ken Scheer.(740 × 587 (160 KB)) - 22:48, 8 May 2021