HJ,
I have no idea why the sudden failure happens, and it relates to a specific yard, but I can give you the Air Brake and Train Handling definition of Qualified Person, verses Qualified Mechanical Inspector.
BNSF ABTH Rule 100.1 - Basically says this ABTH is written to cover FRA rules…
100.2 "Inspect and test brake equipment on locomotives and cars according to hte Federal Railroad Administration regulations contained within these rules…
Inspections and air brake tests may be preformed by either a “Qualified Person” or a “Qualified Mechanical Inspector”.
A “Qualified Person” refers to a trainman given fundamental training on freight car inspections and air brake tests and a “Qualified Mechanical Inspector” refers to a person such a (sic) carman who has been given more extensive training that provides for a more detailed inspection. All trainman are “Qualified Persons” in the application of the following rules.
Inspection and air brake tests by a “Qualified Mechanical Inspector” provide a greater distance that a train may travel before additional inspections and tests are required. Inspection of equipment, when required, must be preformed on both sides at some point during the inspection and air brake test to be able to examine and observe the functions of all moving parts of the brake system on each car as necessary, as well as to comply with all parts of GCOR Rule 1.33. Roll-by inspections may only be utilized to determine that all brakes have been released and may not be used to perform all other inspection requirements for either side of the train."
Rule 100.10 Initial Terminal and Road Air Brake Test (Class I Air Brake Test)
"A qualified employee must conduct and initial terminal air brake test to inspect air brake and safety appliances and to test brake pipe integrity.
A. Requirement for test
Test must be conducted
Where train ins original assembled…
Where a unit or cycle train has traveled 3,000 miles since it’s last Class I Air Brake Test…
Trains designated as “Extended Haul” must be given a air brake inspection and tests preformed by a Qualified Mechanical Inspector and train may be operated greater than 1,000 miles but not toe exceed 1,500 miles before an additional Intermediate or Initial Terminal Inspection and Air Brake Test is required. To apply the extended distance for this type of inspection and air brake test: …
An set out in route must be given an inbound inspection by a Qualified Mechanical Inspector.
Any cars of solid block of cars added en route must be pretested by a Qualified Mechanical Inspector…
Train must be given inbound inspection by a Qualified Mechanical Inspector at 1,500 mile intermediate inspection points."
I hope this explains the difference in the types of inspections by carman, verses trainman.
From the article it sounds like one of the shifts of carman got cut. So instead of having a 3 shift carman, CN went to 2 shifts or 1 shift at that location.
Craig