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 Railroad Administration has developed a noise computation method to assess the noise impact of train horns in the vicinity of highway-rail grade crossings. This method uses a special train horn noise model to predict noise levels to the side of the railway which incorporates the FRA noise impact criteria.