STC SmartScanIS, User Manual

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EUD-2016026-00 Rev.2, SmartScanIS User’s Guide for Union Pacific, 14 January 2021
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Chapter 6
Installing the Track Components
For purposes of this guide, track components are scanners, transducers, track circuits,
auxiliary-alarm detectors, and AEI antennas. This chapter tells how to install scanners,
transducers, track circuits, and AEI antennas. The installation of dragging-equipment
detectors and other auxiliary-alarm detectors isn't covered in this guide.
All SmartScanIS sites have two bearing scanners per track. Some tracks also have two wheel
scanners. All tracks have two gating transducers. Gating transducers are used to control
scan timing and car recognition. All tracks have either two advance transducers or one track
circuit. Advance transducers and track circuits are used to indicate train presence.
Track components are installed in this order.

Bearing scanners and their cables

Gating transducers and their cables

When used, advance transducers and their cables

When used, wheel scanners and their cables

When used, the track circuit and its wires

When used, AEI antennas and their cables

When used, auxiliary-alarm detectors and their cables
The instructions that follow only work in the northern hemisphere . If your site is south of
the equator, skip the instructions in this chapter and call STC for help.