You do not need a license key to start designing. The official free version of SCARM is powerful but has specific limits. You can use up to 100 track pieces per layout. Layer Limit: You can use a maximum of 5 layers.
You can only place up to 100 tracks and objects in a single layout design. scarm license key free better
Includes access to massive libraries of track brands (HO, N, O, G scales). You do not need a license key to start designing