"A curve laser method is used only in sideward displacement of a track at curves while the normal straight laser method is used at straight sections in sideward displacements. The curve laser method is based on the principle that the laser transmitter is positioned at a known point on the track and directed to the track repair machine positioned at a known point." http://www.freepatentsonline.com/5157840.html
-------------------------------------------------- Note added at 17 mins (2009-10-27 08:19:26 GMT) --------------------------------------------------
IF Bogen as in electrical arc isn't on the wrong tracks, here's another ref.:
"A curve laser method is used only in sideward displacement of a track at curves while the normal straight laser method is used at straight sections in sideward displacements. The curve laser method is based on the principle that the laser transmitter is positioned at a known point on the track and directed to the track repair machine positioned at a known point." http://www.freepatentsonline.com/5157840.html
-------------------------------------------------- Note added at 17 mins (2009-10-27 08:19:26 GMT) --------------------------------------------------
IF Bogen as in electrical arc isn't on the wrong tracks, here's another ref.:
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peer agreement (net): +3
