Autonomous Model Railway With Collision Avoidance

A self-running model railway simulation with at least three trains on shared tracks. Trains autonomously operate junctions and signals to prevent collisions, with all visual design decisions left to the model. The author states this exact prompt was given to both Fable 5.1 and GPT-6 Astra.

Prompt optimization tips

1

Specify editability

State which objects must remain separate, named and editable; otherwise a visually convincing shell may still be unusable.

2

Close the test loop

Ask the model to run the scene, inspect visible failures and repeat until concrete frame-rate, interaction and layout checks pass.

3

Stage long builds

For large worlds, split the work into districts, assemblies or milestones and approve each section before expanding scope.

Imagine It. Shape It.