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 latest 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 (maximum speed is 10 mph).
  • Nolan’s portable derails come in two sizes (PD-4 and PD-5), which cover all rail sizes from 70 lb. to 141 lb.

PD-4R Specs Table


  • Low Profile: The top of the derail block sits just 2-3/4” above the top of the rail head.
  • Lightweight: Nolan’s portable derail weighs just 46 lbs.
  • Security: The portable derail, staff, and flag can be padlocked to the rail head to ensure visibility and safety, and to prevent unauthorized removal.
  • Easy Installation: Portable derails fit onto the track easily and require no special tools to install.


Double End

Double End for Mines

Single End

Staff Assembly (For PD-1/PD-2)

Staff Assembly (For PD-4/PD-5)