number of wagons in the wagon chain mismatch

TrainRoute.nut

			local cargo = Utils.getCargoId(m_cargoClass);
			/* Check if we have money first to buy entire parts */
			local cost = AIAccounting();
			AITestMode() && AIVehicle.BuildVehicleWithRefit(depot, this.m_engineWagonPair[0], cargo);
			local num_wagons = this.m_engineWagonPair[2];
			while (num_wagons > 0) {
				AITestMode() && AIVehicle.BuildVehicleWithRefit(depot, this.m_engineWagonPair[1], cargo);
				num_wagons--;
			}
			if (Utils.HasMoney(cost.GetCosts())) {
				new_vehicle = TestBuildVehicleWithRefit().TryBuild(depot, this.m_engineWagonPair[0], cargo);
				if (AIVehicle.IsValidVehicle(new_vehicle)) {
					local num_tries = this.m_engineWagonPair[2];
					local wagon_chain = AIVehicle.VEHICLE_INVALID;
					local num_wagons = 0;
					while (num_tries > 0) {
						local wagon = TestBuildVehicleWithRefit().TryBuild(depot, this.m_engineWagonPair[1], cargo);
						if (AIVehicle.IsValidVehicle(wagon) || AIVehicle.IsValidVehicle(wagon_chain)) {
//							AILog.Info("wagon or wagon_chain is valid");
							if (!AIVehicle.IsValidVehicle(wagon_chain)) wagon_chain = wagon;
							num_wagons = AIVehicle.GetNumWagons(wagon_chain);
							num_tries--;
						} else {
							break;
						}
					}
					if (num_wagons < this.m_engineWagonPair[2]) {
						if (AIVehicle.IsValidVehicle(wagon_chain)) {
							if (!AIVehicle.SellWagonChain(wagon_chain, 0)) {
//								AILog.Info("Failed to sell wagon chain. Reason: missing wagons");
							} else {
//								AILog.Info("Sold wagon chain. Reason: missing wagons");
							}
						}
						if (!AIVehicle.SellVehicle(new_vehicle)) {
//							AILog.Info("Failed to sell train. Reason: missing wagons");
						} else {
							new_vehicle = AIVehicle.VEHICLE_INVALID;
//							AILog.Info("Sold train. Reason: missing wagons");
						}
					} else {
//						AILog.Info("new_vehicle = " + AIVehicle.IsValidVehicle(new_vehicle) + "; wagon_chain = " + AIVehicle.IsValidVehicle(wagon_chain));
						if (!AIVehicle.MoveWagonChain(wagon_chain, 0, new_vehicle, 0)) {
//							AILog.Info("Failed to move wagon chain");
							if (!AIVehicle.SellWagonChain(wagon_chain, 0)) {
//								AILog.Info("Failed to sell wagon chain. Reason: failed to move wagons");
							} else {
//								AILog.Info("Sold wagon chain. Reason: failed to move wagons");
							}
							if (!AIVehicle.SellVehicle(new_vehicle)) {
//								AILog.Info("Failed to sell train. Reason: failed to move wagons");
							} else {
								new_vehicle = AIVehicle.VEHICLE_INVALID;
//								AILog.Info("Sold train. Reason: failed to move wagons");
							}
						} else {
//							AILog.Info("Wagon chain moved successfully");
//							AILog.Info("new_vehicle = " + AIVehicle.IsValidVehicle(new_vehicle) + "; wagon_chain = " + AIVehicle.IsValidVehicle(wagon_chain));
//							AILog.Info("number of wagons in new_vehicle = " + AIVehicle.GetNumWagons(new_vehicle));
						}
					}
				}
			}