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AMTS Rail Clip Prisms

The rail clip prism is installed on tracks to monitor for settlement, heave, lateral displacements, and changes in super-elevation. It has two components: the rail clip which clamps directly to the rail and the L-bar mini prism which is the target for the AMTS.   Datasheet

Rail Clip with Prism

Rail Clip Prism

Rail Clip Prisms on Track

Installed Prisms

Monitoring Tracks

AMTS Monitoring Rail Clip Prisms


Easy Installation: Position rail clip and tighten screws. No drilling or wiring required.
Durable: Simple, waterproof construction with no moving parts or electronics.
High Performance: Coated optics for better performance.
Cost Effective: Low cost per monitored point compared to conventional sensors.


  1. Fit the rail clip to the rail. Tighten the hex screws until the clip is firmly attached.
  2. Attach the L-bar, adjusting its angle so that the prism will directly face the AMTS.
  3. Attach the prism to the L-bar, aiming it at the AMTS.


Rail Clip: Powder-coated steel, stainless steel screws. Available in 5.5 or 6-inch sizes.
L-Bar Bracket: black anodized aluminum, 3 inch arms.
Prism: 25 mm optical glass with anti-reflection and copper coatings.
Prism Offset: -25.5 mm for Topcon, Trimble,etc. +8.92 mm for Leica.