Telemetry can be used to perform air brake tests and meet two-way equipped requirements when which conditions are met?

Telemetry can be used to perform air brake tests and meet two-way equipped requirements when which conditions are met?

• A. The controlling locomotive has an operative HTD; The rear car is equipped with an operative EOT capable of two-way communication; readouts do not differ by more than 3 PSI.
• B. The locomotive has an operative HTD only.
• C. The rear car has an EOT capable of two-way communication but no HTD.
• D. Readouts between EOT and HTD differ by more than 3 PSI.

Answer: (A)

Two-way telemetry for an air brake test relies on real-time communication between the locomotive and the train’s end-of-train equipment, plus consistent readings. The test is valid only if the locomotive has an operative head-end telemetry device (HTD) so the locomotive can drive and monitor the test, and the rear-end device (EOT) can respond with two-way communication to confirm what’s happening at the far end of the train. In addition, the readings from the HTD and the EOT must agree within a tight tolerance—no more than 3 PSI difference—so that the data reflects the same brake state across the train. When all three conditions are met—HTD is operative, the rear EOT supports two-way communication, and the HTD and EOT readouts differ by no more than 3 PSI—the telemetry-based air brake test satisfies the two-way equipped requirement. If any condition isn’t met, or the Readouts diverge beyond 3 PSI, the telemetry test isn’t considered valid for meeting the two-way requirement.

Two-way telemetry for an air brake test relies on real-time communication between the locomotive and the train’s end-of-train equipment, plus consistent readings. The test is valid only if the locomotive has an operative head-end telemetry device (HTD) so the locomotive can drive and monitor the test, and the rear-end device (EOT) can respond with two-way communication to confirm what’s happening at the far end of the train. In addition, the readings from the HTD and the EOT must agree within a tight tolerance—no more than 3 PSI difference—so that the data reflects the same brake state across the train. When all three conditions are met—HTD is operative, the rear EOT supports two-way communication, and the HTD and EOT readouts differ by no more than 3 PSI—the telemetry-based air brake test satisfies the two-way equipped requirement. If any condition isn’t met, or the Readouts diverge beyond 3 PSI, the telemetry test isn’t considered valid for meeting the two-way requirement.