Add realistic steam or diesel sound to your layout with this stand-alone system for all scales. Featuring digitally recorded sounds, this unit brings railroading to a new dimension of fun and enjoyment. Sounds include diesel idle and user-controllable rev-up, controllable steam chuff rate, rail clack, crossing bell, user-selectable horns and whistles. So versatile you can add sound on sound for added realism. Includes a two-way speaker system, handheld controller, five-watt amplifier and power supply.