At the request of the client Obermeyer Hellas Ltd, Geokos A&A conducted the geotechnical research of the Railway Fushe Kosova - Han I Elezit in 2015. The drilling was carried out in very difficult mountain terrains, and this project has been among the most challenging projects in terms of execution.

The geotechnical investigation for the Fushë Kosovë - Mitrovica Railway was conducted in 2018 by order of the client Obermeyer Hellas Ltd. Geomechanical drilling, SPT testing, CPTu testing, and laboratory testing were performed for this railway line.

In 2019, at the request of Hill International LLC, Geokos A&A conducted geotechnical research for the Fushë Kosovë - Podujeva Railway, a project in which, in addition to geotechnical drilling, SPT testing, and CPTu testing, drilling was carried out inside the tunnels to obtain undisturbed samples of rock in order to examine the existing condition of the tunnel.