sentences:  Beginning in 1983, both the "Desert Wind" (with service from Chicago to Los Angeles) and the "Pioneer" (with service from Chicago to Seattle) previously stopped at the Helper station.Service by the "Pioneer" was dropped when that train was rerouted through Wyoming in 1991 (the train was later discontinued altogether in 1997).Service by the "Desert Wind" ended when Amtrak discontinued that train in 1997 (at the same time as the "Pioneer" was discontinued).