A mass of masonry supporting an arch or a beam at the end of a bridge.
A long raised structure made of concrete, iron, or steel that allows trains to travel above the surrounding area.
A system of tracks of defined limits for the purpose of storing and servicing cars.
A short length of track, that is radically out of it desired alignment. This track defect usually occurs in track with Continuous Welded Rail and is caused by sub-standard conditions or deficiencies coupled with high rail temperatures, high axial forces, and the dynamic loads of moving trains. (also call a Heat Kink)
The position of Track in the horizontal plane expressed as Tasngent or Curve.
The separation of rail ends due to cold temperatures or rail creep.
A mechanical device installed on the track that dispenses rail lubricants to rolling stock wheels to reduce friction between wheel flanges and the railhead.
A sideways movement of the track due to dynamic force and/or thermal force.
A switch in which the back of the switch rail in the point area is made into an angle, thereby "tucking" the switch point partially under the railhead of the stock rail. This requires the use of a mating, undercut, (Samson undercut)
A non-conducting material used to hold the third rail in position and electrically insulate it from the track structure.
A pair or group of turnouts which allows trains or on-track equipment to cross from one track to another.
The vertical relation between the top of the two rails of a track.
Track with straight alignment.,
A rail joint which stops electrical current from flowing from one rail to another; separates sections of track into distinct circuits for signal shunting.
A device installed on the Rail Base preventing longitudinal rail movement and build-up of Axil Force.
A shim placed between a rail fastening pas and the 2nd pour concrete to adjust the surface of the track.