Relay API Reference

Native modules available to Relay scripts, grouped by whether you need to import them.

Auto-imported

Available as bare globals in every script — no import needed. See Globals for the full list: printing/string/utility functions, the Vector3 type, and the Coroutine() function.

Import required

Module	Description
math	Constants and math functions
log	Logging (debug/info/warning/error)
json	Sandboxed JSON file loading, asset pack scripts only
railroader	The game itself: world, UI extension, cars, track, operations

Asset packs can also export their own modules for cross-pack imports (from "domain/module" import ...) — see Modules.