The Beast for everyone who told that they wanted a louder, nastier train horn - here it is. Three tuned trumpets, 17-1/2 inches, 14-1/2 inches, 11-1/2 inches. High impact ABS. Flat rack design requires 40 percentage less clearance than the 500 series train horns. Trumpets can be separated from the mounting brackets for installation in vehicles that could not otherwise fit full-size train horns. This model can be upgraded with the BlastMaster upgrade kit to make it go even louder.