Here's some interesting excerpts from a Canadian TSB report where supervisors were more worried about maintaining on-time performance than they were about alarm bells going off.
During this conversation, the Vancouver maintenance foreman recalled having told the manager about the "hot box" problem and asked the manager to contact the maintenance foreman at Jasper, Alberta, to have him perform a bearing inspection.
After reviewing the customer service en route reports, which indicate on-time performance and problems encountered by trains, the manager concluded that, since Train No. 2 was operating on time and without further problems, he would not advise the maintenance foreman at Jasper. (emphasis added)
The crew from Jasper changed off with a new crew in Edmonton and the new crew left eastbound with no knowledge of the previous bearing alarm and the disconnection of the bearing monitoring system.
SOURCE:
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www.tsb-bst.gc.ca]