That happens when a vehicle has an effect entry that's empty. The mod isn't supposed to add effects it can't find but it looks like there might be a bug somewhere. I'll look into it.

Hmmm you accidentally learned how to create a Ghost Train. Perfect for Halloween!

Something with sunset harbor must have brought this bug back, several train assets I have are now exhibiting this bug following the update/new DLC.

The Log File is giving me these two errors:

NullReferenceException: Object reference not set to an instance of an object
at VehicleEffects.GameExtensions.VehicleEffectWrapper.RenderEffect (InstanceID id, SpawnArea area, Vector3 velocity, Single acceleration, Single magnitude, Single timeOffset, Single timeDelta, .CameraInfo cameraInfo) [0x00000] in <filename unknown>:0
at Vehicle.RenderInstance (.CameraInfo cameraInfo, .VehicleInfo info, Vector3 position, Quaternion rotation, Vector3 swayPosition, Vector4 lightState, Vector4 tyrePosition, Vector3 velocity, Single acceleration, Color color, Flags flags, Int32 variationMask, InstanceID id, Boolean underground, Boolean overground) [0x00000] in <filename unknown>:0
at Vehicle.RenderInstance (.CameraInfo cameraInfo, UInt16 vehicleID) [0x00000] in <filename unknown>:0
at VehicleManager.EndRenderingImpl (.CameraInfo cameraInfo) [0x00000] in <filename unknown>:0
at SimulationManagerBase`2[Manager,Properties].EndRendering (.CameraInfo cameraInfo) [0x00000] in <filename unknown>:0
at VehicleManager.IRenderableManager.EndRendering (.CameraInfo cameraInfo) [0x00000] in <filename unknown>:0
at RenderManager.LateUpdate () [0x00000] in <filename unknown>:0

__________________________________________________________________________

Simulation error: Array index is out of range.
at PassengerTrainAI.StartPathFind (UInt16 vehicleID, .Vehicle& vehicleData) [0x00000] in <filename unknown>:0
at PassengerTrainAI.SetTarget (UInt16 vehicleID, .Vehicle& data, UInt16 targetBuilding) [0x00000] in <filename unknown>:0
at CargoTruckAI.ChangeVehicleType (.VehicleInfo vehicleInfo, UInt16 vehicleID, .Vehicle& vehicleData, Position pathPos, UInt32 laneID) [0x00000] in <filename unknown>:0
at CargoTruckAI.ChangeVehicleType (UInt16 vehicleID, .Vehicle& vehicleData, Position pathPos, UInt32 laneID) [0x00000] in <filename unknown>:0
at TrafficManager.Custom.AI.CustomVehicleAI.CustomUpdatePathTargetPositions (UInt16 vehicleId, .Vehicle& vehicleData, Vector3 refPos, System.Int32& targetPosIndex, Int32 maxTargetPosIndex, Single minSqrDistanceA, Single minSqrDistanceB) [0x00000] in <filename unknown>:0
at CarAI.SimulationStep (UInt16 vehicleID, .Vehicle& vehicleData, .Frame& frameData, UInt16 leaderID, .Vehicle& leaderData, Int32 lodPhysics) [0x00000] in <filename unknown>:0
at VehicleAI.SimulationStep (UInt16 vehicleID, .Vehicle& vehicleData, UInt16 leaderID, .Vehicle& leaderData, Int32 lodPhysics) [0x00000] in <filename unknown>:0
at TrafficManager.Custom.AI.CustomCarAI.CustomSimulationStep (UInt16 vehicleId, .Vehicle& vehicleData, Vector3 physicsLodRefPos) [0x00000] in <filename unknown>:0
at TrafficManager.Custom.AI.CustomCargoTruckAI.CustomSimulationStep (UInt16 vehicleId, .Vehicle& vehicleData, Vector3 physicsLodRefPos) [0x00000] in <filename unknown>:0
at VehicleManager.SimulationStepImpl (Int32 subStep) [0x00000] in <filename unknown>:0
at SimulationManagerBase`2[Manager,Properties].SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
at VehicleManager.ISimulationManager.SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
at SimulationManager.SimulationStep () [0x00000] in <filename unknown>:0
at SimulationManager.SimulationThread () [0x00000] in <filename unknown>:0 [Core]

(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/DebugBindings.gen.cpp Line: 51)