Which location is NOT specified for conducting Class 1 tests on trains?

Conducting Class 1 tests is a crucial aspect of ensuring that railcars and locomotives are functioning correctly, especially after significant changes or conditions that could affect their performance. One specific location where Class 1 tests are NOT typically conducted is when a unit train has traveled less than 2,000 miles.

This is because the Class 1 test is generally triggered by events that could potentially impact the braking system or the overall safety of the train. A train that has traveled less than 2,000 miles is considered to be in a state where it hasn't undergone the necessary stress or wear that would necessitate testing. It reflects the intention to focus testing efforts on situations where the likelihood of needing to verify the integrity of the air brake system is higher, such as when the train has undergone significant modifications, maintenance, or has been in a potential fault condition due to prolonged downtime or changes in composition.

In contrast, the other locations mentioned are all justified settings for performing Class 1 tests, as they represent scenarios where there has been a significant alteration in the train's status that could affect safety and operational efficacy.