FoulGUARD

Foul-Zone Status

FoulGUARD reinforces operating discipline by making foul-zone and adjacent-track status visible in the moment — helping prevent sideswipes near turnouts during active moves. Yard-side indication plus YardGUARD in-cab status supports clear go/no-go confirmation and if needed automated emergency braking near turnouts and other high-risk areas.

Part of YardGUARD’s real-time safety intelligence system – helping teams verify conditions and proceed with confidence.

Talk to a YardGUARD Specialist  Watch How it Works

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What It Does

Makes foul-zone and adjacent-track clearance status visible in the moment.

Key Benefits

  • Reinforces clearance discipline where risk concentrates near turnouts and adjacent tracks
  • Helps reduce sideswipe risk and interruption-driven downtime
  • Supports steady flow in high-activity zones
  • Can support automated emergency braking in defined scenarios

See how FoulGUARD integrates with YardGUARD across the railyard

Download the YardGUARD brochure

How It Works

  • Yard-side indication provides local status in the foul zone
  • Status is displayed on the YardGUARD in-cab screen for confirmation
  • Designed for real yard conditions and repeatable confirmation steps

What the Team Sees

In the yard:
Light indicating foul zone status adjacent to switch

In the cab:
Foul zone status on the YardGUARD system view

Technical Details 

  • Advanced sensors detect equipment in the foul zone
  • High-intensity LED warning lights
  • All-weather construction
  • Low-maintenance design and long-life LED bulbs
  • Flexible power options: solar or hardwired
A railway switch system with a solar panel and signal sign, located where multiple train tracks intersect on a foggy day.
Infographic showing five Yard Guard safety systems: Stop Guard, Watch Guard, Crossing Guard, Gap Guard, Derail Guard, and Foul Guard, by Marmon Rail Technologies.

YardGUARD — Safety Intelligence for the Yard

YardGUARD is Railserve’s integrated railyard safety system — built from six interconnected components that work together across critical zones.

Learn about YardGUARD

A railway crossing with barriers, warning lights, a train, and a solar-powered device on a trailer; "Crossing GUARD" logo is displayed at the bottom.

CrossingGUARD

High-visibility control that keeps yard crossings coordinated and safe.

A nighttime rail yard scene shows several freight cars on tracks with derail devices and indicator lights; "DerailGUARD" logo is displayed at the bottom.

DerailGUARD

Multi-layered confirmation of derail status with activation of emergency braking as needed.

A railway track with a signal, a device labeled "GapGUARD," and freight cars in the background under cloudy skies.

GapGUARD

Switch alignment/gap awareness that confirms status before a move proceeds.

A rail worker in safety gear stands near train cars on tracks; the image includes the StopGUARD logo and branding at the bottom.

StopGUARD

Automated emergency braking and crew awareness support when seconds matter.

A freight train travels along railroad tracks at night with headlights on; the WatchGuard logo appears at the bottom of the image.

WatchGUARD

In-cab hazard and alignment monitoring that improves visibility and activates emergency braking as needed.

See YardGUARD in Action

Talk to an Expert  Download Brochure  See YardGUARD Demo