The Pinallon Line or Vinylon Line is an electrified, freight-only industrial railway line of the Korean State Railway in Hamhŭng, South Hamgyŏng, North Korea, running from Hamhung marshalling yard to Hŭngnam via the February 8 Vinylon Complex in Hŭngnam.

[1] It runs parallel to the narrow-gauge Sŏho Line for most of its length.

The Pinallon Line was opened by the Korean State Railway in May 1961, when the February 8 Vinylon Complex was opened,[2] as the existing narrow-gauge Sŏho Line was insufficient to meet the freight-hauling requirements of the industrial complex.

These industries include: as well as several other smaller enterprises.

A yellow background in the "Distance" box indicates that section of the line is not electrified.