In a world where there is a shortage of materials and raw materials which could push companies to overstock increasing warehousing related costs furtherly increasing the raw materials prices, the optimization of inventory levels is fundamental to achieve competitive advantages, reducing costs compared to competitors while remaining efficient. Alstom is a world leader in the train sector, both in production and services related to their maintenance, along with other related infrastructures. With over 70,000 workers and 15b$ of revenues, (after the acquisition of Bombardier Transportation, is one of the biggest companies in the field and one of the most successful ones.