Tucumcari to Dalhart

From the 8,200 ft. south siding (MP 639.8 - MP 638.1) and then 6,800 ft. north siding (MP 638.1 - MP 636.7) at Tucumcari, once the changeover in operations between the Southern Pacific (to the south and west) and the Rock Island (to the north and east) before the latter's 1980 dissolution, where an erstwhile SP (Dawson Railway) line to French and Dawson once headed away north-northeast and a Rock Island line once headed away east (i.e on the south side of the line), the single track, CTC, line, with speed limit rising to 70 mph, heads east-northeast past Adberg, a detector at MP 630.0, the 9,120 ft. siding at Mater (MP 623.0 - MP 621.2), and a detector at MP 621.1, a turn to the north, a bridge over the Canadian River, a detector at MP 616.6, where the speed limit is 50 mph for the bridge, Logan (MP 615.3), a turn northeast, a detector at MP 613.0, a detector at MP 605.0, where the speed limit has returned to 70 mph, Sand Springs, the 9,075 ft. siding at Obar (MP 598.9 - MP 597.0), and Naravisa (MP 590.8).

After crossing the New Mexico-Texas State Line into the Texas Panhandle, the line, still heading northeast, passes a detector at MP 585.6, the 9,070 ft. siding at Romero (MP 579.2 - MP 577.1), a slight joggle in the heading more towards the east and then back again, a detector at MP 570.0, Middlewater, the 9,270 ft. siding at King (MP 562.6 - MP 560.5), a detector at MP 554.3, a Hold Signal at CP TC548 (MP 547.8), the flat crossing with the BNSF (former Fort Worth & Denver) at BNSF Xing (MP 545.6), with connectors in the north and east quadrants, where the speed limit has fallen to 60 mph, and the 7,290 ft. siding at Dalhart (MP 545.6 - MP 544.0).