There are several of railroad crossing signs and signals that indicate highway-railway crossing. Railroad crossbucks signs are found at most crossings. A crossbuck is a sign composed of 2 slats of wood or metal of equal length, fastened together in the shape of letter: X. Crosbuck singes are yield signs. You are legally required to yield the right of way to trains. Instructions to the drivers are: - Slow down, - Look and listen for a train, - Stop if train approaches.