The Quahog Sub (Quahog Subdivision) is a well-known freeware route in the Trainz Simulator community, primarily developed by user Robert Barnes. It is a fictional, sprawling rail network based loosely on Southern California geography.

Check Version Compatibility: Ensure you are downloading the version that matches your simulator (e.g., v3.2 for TRS19 or v4.0 for TRS22).

, which has been featured in community media posts showcasing high-end rolling stock like the California Zephyr Southern Pacific GS-4 Daylight Key Features Detailed Environments

• Repainting rolling stock: extract the wagon/locomotive texture, edit in your image editor, repackage as a new repaint with unique asset UID.
• Editing the route: open the route in Surveyor mode, use the Texture and Sculpt tools to tweak terrain and add local features (ponds, roads).
• Trackwork changes: add a short industrial spur, extend the yard, or add a crossover—test turnouts for clearance and spline issues.
• Scripting triggers: use Trainz’s scripting triggers to create time-based events (e.g., scheduled arrival of a connecting mainline train) or to automate freight exchange.
• Asset performance: optimize by reducing high-poly props and limiting dense foliage to keep framerate stable.

A Tour of the Route: From Quahog Yard to Point Judith

Let’s break down the major geographical landmarks you will encounter on the Quahog Sub.

Trainz Simulator 22 routes compilation screenshots - Facebook