Aquinas' definition. The Oxford Concise Dictionary of the Christian Church defines acedia (or accidie) as a state of restlessness and inability either to work or to pray. Some see it as the precursor to slothâone of the seven deadly sins.
A train horn is a powerful air horn that serves as an audible warning device on electric and Diesel locomotives. The horn's primary purpose is to alert persons and animals to an oncoming train, especially when approaching a grade crossing. The horn is also used for acknowledging signals given by railroad employees, such as during switching operations.
The federal regulation concerning train horns is officially known as the FRAâs Final Rule on the Use of Locomotive Horns at Highway/Rail Grade Crossings and became effective June 24, 2005. Quiet Zones. Union Pacific believes quiet zones compromise the safety of railroad employees, customers, and the general public.