Track Maintenance and Engineering Instructions - Metrolink

Continuous Welded Rail (CWR): Rail that is 400 foot or greater in length. Rail laid intypical lengths of 1,500 feet or so (roughly a 1/4-mile), rather than 39-foot stick railbolted together. CWR will not buckle if properly adjusted and anchored.Controlled Siding: A siding where switches and signals are remotely controlled by adispatcher.Control Point: An interlocking or the location of a track signal which dispatchers canspecify when controlling trains.Cross Buck: Highway or roadway vehicle signage to indicate the approach of a roadwayto a railroad grade crossing.Crossover: Facilitates the movement of rail equipment onto parallel tracks via back-tobackswitches.Crossing: Commonly known as a diamond, they allow for railroad tracks to intersecteach other at any type of angle that does not allow for actually switching on to the othertrack. It is also the term often referred to the place where highways and railroad tracksmeet commonly known as grade crossings.Cross Tie: See Tie.Derail: Track safety device to guide rolling stock or other equipment off the rails at aselected spot as means of protection against equipment out of its secured limits. A trackdesigned to derail rolling stock in case of an emergency.Destress: See Adjusting/Destressing.Diamond: Similar to a crossing, a situation when two railroad lines cross one anotherwithout the means of switching onto the other track. See Crossing.Double Track: Parallel sets of main line tracks, typically found in areas with highdensities of traffic.Dynamic Track Stabilizer: On-track equipment used to mechanically compact the trackstructure and increase the track’s lateral load capacity.Fill: A railroad right-of-way formed by leveling a low area to keep the ruling grademanageable.Fit Rail: Used rail that has been visually inspected and ultrasonically tested within thelast 6 months and found fit for use.SCRRA ENGINEERING INSTRUCTIONS 2 of 8 Revision Issue: 2-12-09APPENDIX B – GLOSSARY