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.
Cab signals and blocks. Railroad signaling is one of my favorite aspects of railroading, but I'm having trouble understanding how cab signals operate. For those who don't know (but want to follow along), these are indications in the locomotive cab that augment or replace fixed wayside signals.