DC-castingCasting processCasthouse models are highly advanced and have been used for decades to optimize castingCasting technology and parameters. Modern DC-castingCasting lines are fully automated with complex control systemsControl system, typically including a main programmable logic controller (PLC) communicating with multiple PLCs, sensors for data measurementMeasurements, databases with recipes, trending software, and user interfaces. Due to the complexity, full factory acceptance test (FAT) or program tests before shipping are often not possible. Hycast has developed digital twinsDigital twin for complete castingCasting lines to enable pre-shipping program tests and virtual commissioning. These digital twinsDigital twin replicate all relevant equipment and sensors, providing real-time data to the control systemControl system. This setup allows for virtual casts, saving several man-weeks during on-site commissioning. Additionally, digital twinsDigital twin can be used for future optimization of castingCasting lines. Examples of virtual commissioning of new castingCasting lines are detailed in the paper.