"Kindly do not flush the toilet while the train is standing in the station," Amtrak officials said Thursday.

Rep. Howard Nielson, R-Utah, claimed victory in his war on trackside sewage, saying a list of steps the railroad announced it will take will clean up the problem.Nielson said Amtrak will lock restrooms on certain cars that dump wastes directly on tracks, and fix other equipment so no dumping can occur at speeds under 35 mph.

In addition, operating rules will specify that dumping cannot take place close to stations and other restricted areas, or near track work crews.

Amtrak could still dump train toilets on tracks in areas well away from populated areas such as on the west desert, a Nielson spokesman said.