attention snide , il faut toutes les tailles de bat et tous les levels , je crois . 
il faudrait créer un topic sur le "building theme" pour le futur. 
ou qu'un "spécialist" s'arrette  nous voir... 
 
arf ma nouvelle erreur , qui arrive à 85000habitant  
 
à+++ 
edit:ave le message d'erreur ,c'est mieux
Object reference not set to an instance of an object [System.NullReferenceException]
Details:
No details
System.NullReferenceException: Object reference not set to an instance of an object
  at TrainAI.ResetTargets (UInt16 vehicleID, .Vehicle& vehicleData, UInt16 leaderID, .Vehicle& leaderData, Boolean pushPathPos) [0x00000] in <filename unknown>:0 
  at TrainAI.InitializePath (UInt16 vehicleID, .Vehicle& vehicleData) [0x00000] in <filename unknown>:0 
  at TrainAI.PathFindReady (UInt16 vehicleID, .Vehicle& vehicleData) [0x00000] in <filename unknown>:0 
  at TrainAI.SimulationStep (UInt16 vehicleID, .Vehicle& data, Vector3 physicsLodRefPos) [0x00000] in <filename unknown>:0 
  at CargoTrainAI.SimulationStep (UInt16 vehicleID, .Vehicle& data, 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