Ash Fork to Williams Junction

At the 5,650 ft. siding at Ash Fork (MP 401.2)), the erstwhile right-of-way of the old main line trails in from the west and the line turns onto the old main line to head east, single track, TWC, with speed restriction 40 mph, past a turn north, curvily east-northeast, south and counter-clockwise back to the northeast, past Daze (MP 393.3), where the speed restriction has dropped to 35 mph for the curves, curvily east, curvily north where the erstwhile original Atlantic & Pacific right-of-way once continued east (forming a split double track on this segment, after today's line had been constructed), east, counter-clockwise to the northwest, east-northeast, from where the modern main line can be seen across the valley to the north, at its West Doublea, past Corva (MP 390.2x), curvily east and then east-northeast again, curvily east-southeast, south past Sereno (MP 384.2x), and curvily east past a detector at Supai (MP 371.6), where the  disused original A&P r-o-w trails in on the south side, east-northeast, north and curvily east to the 5,600 ft. siding at Williams (MP 378.1), where the speed restriction rises to 40 mph, the Saginaw Southern Railroad once trailed in on the south side, and there is a connection on the north side with the Grand Canyon Railway, whose depot lies on the north side of the line, with a road crossing to its east, and east-northeast, southeast, and east again to West Williams Junction (MP 375.2), where the line trails into the south side of the two Main Tracks, CTC, former Santa Fe Transcon main line.

Between Ash Fork and Williams, this route is the original Santa Fe main line west, replaced in the early 1960s by the Crookton line deviation used by today’s mainline trains. The line west of Ash Fork was abandoned at that time. Today, all of this west from West Williams Junction is the Phoenix line.