From the junction with the Tacoma Rail Mountain Division at Curtis Switch (MP 0.0), the single track, Yard Limits, 25 mph maximum speed, former Milwaukee Road line heads southwest, past a bridge carrying I-5 overhead, a platform to the northwest, with a wooden depot on it, a four-track maintenance depot to the northwest, a bridge over a culvert, an angled grade crossing, lines of trees on both sides of the track, a bridge over a stream, a dirt track grade crossing, a dirt road grade crossing to a farm, two dirt road grade crossings, a dirt track grade crossing, open fields, a grade crossing, a road alongside to the northwest, a bridge over a culvert, a bridge over a stream, a grade crossing, and Jay, where there was once a flat crossing with the erstwhile Northern Pacific line to the coast.
The line turns west, past two dirt track grade crossings, a bridge over drainage, an angled grade crossing, and a bridge over drainage, southwest, past a grade crossing angled the other way, a dirt track grade crossing, and the Chehalis River to the northwest, northwest past lines of trees, a grade crossing, and West Adna, and north-northwest to a siding and extra track to the east, with an angled grade crossing within the siding, at Milburn (MP 6.5), southwest, past a dirt road grade crossing on the curve, south, with the Chehalis River alongside to the west, west, past a dirt track grade crossing on a driveway, and southwest again, with the river departing to the west, to Ruth (MP 11.0), where there was once a junction with the erstwhile Milwaukee Road line west to Raymond, on the coast, there is a bridge over a side river with the main river off to the northwest, and the line turns south, to Curtis (MP 12.6), whence the Chehalis Western once continued south to Camp McDonald.