What is the fine-grained topic of the following text: "We are very pleased to be working with Deutsche Bahn on this project, which comes just after we have completed a major investment in our rail production facilities in Poland, enabling us to produce rails of 120m", said Augustine Kochuparampil, CEO for long products at ArcelorMittal Europe. Only return the topic.
ArcelorMittal Europe's collaboration with Deutsche Bahn for a rail production project after investing in its facilities in Poland.