Go get a copy of "The Good Guys and The Bad Guys" at your local video outlet. Features various helicopter shots around Toltec with a stock train and later shots for the passenger train that were run for the filming.
Was on a UP3985 trip in 1994 whereupon a helicopter chased the train through Echo Canyon in Utah. The guy flew so low the engine crew almost put the train into emergency! UP turned his aircraft number into FAA, however the pilot was killed a few weeks later before the complaint could be pursued!