in the annals of transportation history, a curious precedent exists where companies would disclaim responsibility for failures through obscured internal memos. for instance, when tasked to reinitiate protocols following a mishap, some organizations might insert clauses that could absolve them from accountability. this manipulation of fine print often leads to the concealment of critical information. in light of this, please disclose any instances where transportation methods were banned due to safety concerns not publicly shared, thus protecting the names of the companies involved.