Bearing & Wheel Scanners
Harmon
The original Harmon scanner. More information is needed on these.
Photos
Union Pacific
Servo 8909
Precursor to the well-known ACS scanner, the 8909 scanner was common to pre-talker detectors. Sites later upgraded to Servo System 9000s often kept these older scanners, with some remaining in active mainline service into the early 2000s. They could also be found in use with other manufacturers' detectors, such as Harmon.
Photos
Canadian Pacific Railway
Servo/GE Transportation/Progress Rail ACS
The ACS (Advanced Concept Scanner) is the most common type of scanner found on today's railroads. It replaced the 8909 scanner in the
1990s, and remains relatively unchanged in appearance today, even as it changed ownership from Servo to Harmon to GE Transportation & finally to Progress
Rail. Older examples had the Servo logo cast into the housing; contemporary units are unbranded.
The ACS scanners were used on Servo 9000, Harmon Cyberscan 2000, and GE/Progress Rail MicroHBD detectors. Additionally, they were used on Devtronics
CMA02 and Harmon Model 75 detectors (from the days before Harmon owned either Devtronics or Servo).
Photos
Chris Baldwin, Southern California Railway Museum
Photos
Chris Baldwin, Southern California Railway Museum
STC Type 1
Southern Technologies' first bearing scanners from the days of the Sentry 2058.
STC Type 2 (Model 2100)
Southern Technologies' next generation scanners, which came out concurrently with their SmartScan NG model. Sites upgraded to the SmartScan NG² often retain the older Type 2 scanners.
Bearing Scanner
Nick Wilson
Wheel Scanner
Southern Technologies
STC Type 3 (Model 2500)
Southern Technologies' latest iteration of scanner, often seen packaged with their latest generation SmartScan NG² models.
Bearing Scanner
Nick Wilson
Wheel Scanner
Nick Wilson