USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

An Implementation Guide for Wayside Detector Systems

Document Series
Reference Materials
Federal Railroad Administration
Subject Rolling Stock
Bearing temperatures, calibration, Dynamic Ratio, DR, Hot Box Detectors, HBD, Truck Hunting Detector, THD, wayside detector systems, wheel flats, Wheel Impact Load Detector, WILD, Wheel Temperature Detector, WTD

DOT is committed to ensuring that information is available in appropriate alternative formats to meet the requirements of persons who have a disability. If you require an alternative version of files provided on this page, please contact
Last updated: Tuesday, May 28, 2019