Mooning the Cog is a tradition in which hikers bare their buttocks to the Cog Railway on Mount Washington, the highest peak in New Hampshire. It is most commonly done by thru-hikers, as they pass by on the Appalachian Trail. It is a twenty- to thirty-year-old tradition, in which, as the train passes the trail, many hikers choose to drop their drawers and moon the passengers. There are several theories as to the reasons for this tradition. One holds that it is an act of protest against the smoke, steam, and noise pollution generated by the railroad, which is known as the Smog Railway to some hikers. According to others, it is a reference to the train's original name, The Railway to the Moon.