Warner Norcross & Judd
Maintenance vehicle and method for measuring and maintaining the level of a railroad track
 A maintenance vehicle and associated method for measuring and correcting the level of a railroad track in a single pass. An instrument carriage, or frog, is towed by and in fixed relationship to the maintenance vehicle. The frog carries at least one inclinometer to measure at least one of longitudinal level and crossfall. As the vehicle periodically stops to work the track e.g. tamping or stoneblowing), the inclinometers are provided with the settling time necessary for accurate readings. In an additionally disclosed method, the track is measured and modeled prior to working using a primary measurement system and is then measured and modeled a second time while the track is worked using the frog. 
Pandrol Jackson, Inc.
E
E01B
inventional
William E. David M. Bruce W. Dennis A.
Perry Johnson Bradshaw Sroka