Layer

NIMBY rails game concepts
Geography	World map Population layer Admin layer
Map objects	Blueprint Track Station Signal Layers Building
Line concepts	Stop Timetable Duration
Train concepts	Run Order
Simulation	Pax Origin Destination Dominating trip Path Accounting Satisfaction

It is possible to create map objects like tracks and buildings in different height layers. The base ground layer is layer 0. Underground layers are -1 to -3, and elevated layers are 1 to 3. Constructions in a given layer do not collide with constructions in a different layer. Underground and elevated layer constructions also do not collide with water or roads. Two special infinite layers additionally do not collide with themselves.