KEYOU invited representatives from the vehicle industry, bus and fleet operators, experts from the worlds of research and teaching, politicians and members of the press to come to Nordhausen on 29 June and see the KEYOU prototype engine presented on the former site of the renowned IFA-Motorenwerke works. KEYOU makes use of an engine test stand in Nordhausen that belongs to its partner adapt engineering GmbH & Co. KG. More than 70 invitations were sent out, primarily to participants in Germany, but to some in other European countries too. The focal point was the prototype engine announced at the beginning of this year: a six-cylinder series diesel engine with a displacement of 7.8 litres supplied by development partner Deutz, which has been converted into a hydrogen engine using KEYOU components. The Munich-based start-up presented its initial results during the event. Visitor feedback showed that the test bench engine exceeded expectations, with attendees saying they were impressed.