Engine facility, Gray Yard, Flagstaff.

Same facility, looking West.  Beyond the yard you can see the newest bit if scenery - the hill/mountain which actually hides the entrance to staging tracks which are above helix.  Entrance to helix is over near Red Rock area in left of photo.  From Gray Yard, track goes to right of photo, clockwise around room, to get to entrance of helix.

Some industries in background behind the yard (above and below).

Better shot of hill/mountain - tunnel portal is entrance to staging, entrance to helix is to the left of photo.

Above and below photo show industrial area (opposite side of wall) of Flagstaff.