fix snow and exposure

core/biome_generator/rails.gd

@@ -1,7 +1,7 @@
 extends Path3D
 
 const STEAM_DISTANCE_STAT: String = "stat_distance_km"
-const DISTANCE_KM_PER_UNIT: float = 0.001
+const DISTANCE_KM_PER_UNIT: float = 0.01
 
 @export_group("Train")
 ##train speed
@@ -83,17 +83,20 @@ var environment_config: EnvironmentConfig
 var wagon_instances: Array[Node3D] = []
 var wagon_progress_offsets: Array[float] = []
 var _pending_steam_distance_km: float = 0.0
+var _initial_is_inmotion: bool = true
 
 func _ready() -> void:
 	randomize()
 	
 	_cache_environment_config()
+	_initial_is_inmotion = is_inmotion
 	
 	if curve != null and curve.get_baked_length() > 0:
 		build_rails()
 		build_train()
 		_plan_stops()
 		_apply_initial_train_start()
+		_apply_train_start_delay()
 	else:
 		print("WARNING: Draw Path3D for rails!")
 
@@ -138,6 +141,23 @@ func _apply_initial_train_start() -> void:
 
 	_snap_train_to_progress()
 
+func _apply_train_start_delay() -> void:
+	if not _initial_is_inmotion:
+		return
+
+	var start_delay_seconds: float = 0.0
+	if environment_config != null:
+		start_delay_seconds = maxf(environment_config.train_start_delay_seconds, 0.0)
+	if start_delay_seconds <= 0.0:
+		return
+
+	is_inmotion = false
+	await get_tree().create_timer(start_delay_seconds).timeout
+	if not is_inside_tree():
+		return
+
+	is_inmotion = _initial_is_inmotion
+
 func _set_next_stop_index_from_current(current_stop_index: int) -> void:
 	if stop_offset.is_empty():
 		next_stop_index = 0