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.
T signals. T signals are special signals for light rail vehicles. These traffic lights display the letter T. Red or yellow T signals tell the drivers of light rail vehicles when to stop or prepare to stop. A white T signal means that the driver of a light rail vehicle can go.