sentences:  Horses normally enter from the rear of the stall, with gates locked behind the horse once it is in place; the front gates of the stall are normally closed as the horse is loaded in, though the starting-gate crew may open it in order to entice a horse who balks at entry.Alternately, a horse may be backed into the stall from the front entry, again done in the case of a skittish horse.The front door of each stall is held closed by an electromagnetic lock.