Your ideas.
Your network.
Your mods.

Create for NIMBY Rails with Kotlin.
From your first signal to advanced behaviour, a guide to understanding and building.

Start a mod ↗Explore the API →

Your rules · Kotlin

signalModel(
    "mymod.signal", "My signal", "my_textures",
    fallback = closed
) {
    rules {
        when {
            !fresh || !routeKnown -> closed
            block == Occupancy.Clear -> open
            else -> closed
        }
    }
}

Your signal. Your behaviour.Declaration excerpt

SDK 0.9

This edition describes a version in development. Experimental features are marked on their pages. · 0.9.0-alpha.2

AT YOUR OWN PACE

A starting point for everyone.

Kotlin, from beginner to advanced

Your first mod

Create your project, add the SDK and write your first signal, step by step.

Create my first signal →02

Give it your rules

Settings, indications, textures and driving: your mod defines its behaviour.

Understand signals →03

Explore the SDK

Trains, tracks, clock and commands. Find Kotlin signatures and types.

Browse the reference →

68 pages · Kotlin examples · Documentation versioned on GitHub

Your ideas.Your network.Your mods.

A starting point for everyone.

Your first mod

Give it your rules

Explore the SDK

A type. A question.A clear answer.

Your ideas.
Your network.
Your mods.

A type. A question.
A clear answer.