Fix motional with correct content

_2024-03/MOTIONAL.md

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 title: "FMI-based Digital Twins in European Projects on Railways"
-author: "Andreas Heckmann ([DLR](https://www.dlr.de/)), Alex Meierhofer ([VIF](https://www.virtual-vehicle.at/)), Blas Blanco Mula ([CAF](https://www.cafmobility.com/))"
+author: "Andreas Heckmann ([DLR](https://www.dlr.de/de/sr)), Alex Meierhofer ([VIF](https://www.virtual-vehicle.at/de/)), Blas Blanco Mula ([CAF](https://www.cafmobility.com/))"
 category: "project"
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-*Missing content, will be fixed soon.*
+The project [`FP1-MOTIONAL`](https://projects.rail-research.europa.eu/eurail-fp1/), implemented by Europe’s Rail Joint Undertaking ([`EU Rail`](https://rail-research.europa.eu/)) and running from 2022-2026, addresses digitalization and data exploitation as a transversal topic essential for many innovation fields in railways such as automation, asset management, operational optimization and new sustainable rail system and service solutions.
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+The Work Stream 2 of the project aims at organizing in particular the modularity, interoperability and composability of the complex high-order digital twins. The figure below, provided by the partner [`CAF`](https://www.cafmobility.com/),  exemplifies a system architecture currently under consideration to implement a digital twin for braking and traction.
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+![CAF Use Case Architecture](CAFArchitecture.png "Architecture Braking & Traction Use Case")
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+The [`Functional Mock-up Interface`](https://fmi-standard.org/) has been selected as the standard exchange format for model components to enable the reuse of existing models and tools and to allow  IP-Protection of model content from commercial suppliers. Special attention in the use case driven work is given to a proper design of interfaces, i.e. the in- and output quantities of component FMUs. It is the goal to deliver a range of digital twin assembly templates similar to the [`Vehicle Interfaces Library`](https://github.com/modelica/VehicleInterfaces) in the automotive field. In order to prepare the future business case, the digital twins will be  compliant and  integrated into in the data ecosystem called [`Rail Data Space`](https://internationaldataspaces.org/usecases/european-rail-data-space/), also addressed within [`FP1-MOTIONAL`](https://projects.rail-research.europa.eu/eurail-fp1/).
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+The authors would like to acknowledge the funding from the Horizon Europe programme under grant agreement No. 101101973 — FP1 - MOTIONAL — HORIZON-ER-JU-2022-01.
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+**Your feedback is very welcome!**