Amtrak's newest Siemens Airo train passes through Spruce, Colorado as it suns south on the Joint Line to a test track in Pueblo, Colorado.

Amtrak's newest Siemens Airo train passes through Palmer Lake, Colorado on its way to a test track in Pueblo, Colorado.

AMTK 79501 (Siemens ALC-42) runs through Monument, Colorado on its way to a test track in Pueblo, Colorado.

Here is a good look at the Siemens ALC-42 cab car on the end of the new Amtrak Siemens Airo Cascades train being ferried to Pueblo, Colorado for testing.

AMTK 79501 (ALC-42) is part of the new Siemens Airo Cascades train being sent from Denver, Colorado to Pueblo for trial tests. Here the train passes over the Santa Fe Bridge in Larkspur, Colorado ... (more)

Amtrak's newest Siemens Airo Cascades train runs south on the Joint Line through Acequia, Colorado while heading to the testing center in Pueblo, Colorado.

Fishermen and paddle boarders all focus on the new Amtrak Siemens Airo Cascades train, which ran through Palmer Lake, Colorado.

AMTK's new Siemens Airo Cascades train was ferried today along the Colorado Front Range, running on the Joint Line between Denver and Pueblo, Colorado.

A rare treat on the Moffat was Amtrak's newest train, the Siemens Airo Cab, seen here at Blue Mountain as it is being taken to Denver then on to Pueblo, Colorado for trials and testing. The rear u... (more)

Parked at Denver's Union Station is Amtrak engine #79501, a new Siemens ALC-42 that is part of Amtrak's newest Airo train for the Cascades passenger line. The train will be taken to Pueblo, Color... (more)

A sight not likely to be seen again is Amtrak's newest Siemens Airo Cascades train, seen here Parked at Denver's Union Station in downtown Denver. It will soon be taken to the testing facility in... (more)