Pandrol Jackson, Inc.

John Kelly (lasers) Limited

David M Johnson

William E Perry

Bruce W Bradshaw

Dennis A Sroka

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.

Maintenance vehicle and method for measuring and maintaining the level

A method of producing a work surface by producing a reference plane 2--2 and traversing a working tool 104 in a direction generally parallel to said reference plane. So that the required work surface can be a surface other than of flat planar form, the distance of the working tool 104 from the reference plane 2--2 is varied in accordance with instructions from a computer 120 in response to a measure of distance travelled.

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Matlock, United Kingdom

David M Johnson