PD-4R Portable Derail

Nolan Portable Derail (Single End)
PD-4 portable derail set up with a PDF-LP staff assembly and a BF-2D DERAIL flag. Staff assemblies and flags are sold separately.

The PD-4R Portable Derail is one of Nolan Company’s low-profile models. It is a single-end derail.


  • PD-4 derails are fabricated from high-strength steel, and completely redesigned for increased effectiveness and ease of installation.
  • Derails are manufactured using a proven design and a lower height above the rail head. They will derail all rolling stock including mainline locomotives when installed and used properly.
  • Nolan’s portable derails come in two sizes (PD-4 and PD-6), which cover all rail sizes from 70 lb. to 141 lb.

PD-4R Specs Table


  • Better Convenience: Covers a broader range of rail sizes — 80 to 141 lbs. Available in left- and right-hand throw.
  • Technically Proven: Like model PD-6, the PD-4 is fabricated from high-strength steel, and will derail all rolling stock, including six-axle, mainline locomotives, when installed properly.
  • Low Profile: Manufactured with a lower height above the rail head, the height of the derail sits only 2-3/4” above the rail.
  • Lightweight: The PD-4 weighs 45 lbs.
  • Easy Installation: The PD-4 models fit on the track easily and require no special tools to install.
  • Security: The PD-4, staff, and flag can be padlocked to the rail head to ensure visibility and safety, and to prevent unauthorized removal.


Double End

Double End for Mines

Single End

Staff Assembly (For PD-1/PD-2)

Staff Assembly (For PD-4/PD-6)