Figure 3
The collage consists of five distinct images related to track geometry measurement equipment. The first image shows a German GEDO CE device positioned on railway tracks, equipped with sensors and mounted on a yellow stand. The second image features a Norwegian Roger 1,000 device, which is a yellow and black train with measurement equipment on top, traveling on railway tracks at night. The third image displays a high-speed train labeled TGV, traveling on railway tracks under a clear sky. The fourth image shows a Parrot AR.Drone, a quadcopter drone with black propellers and a white body. The fifth image is a diagram of a train car, detailing various measurement points and equipment locations, including GPS, TGMS, VDMS, and accelerometer sensors. The diagram includes labels for different sections and measurement points within the train car.Classic track geometry measurement equipment (a) German GEDO CE, (b) Norwegian Roger 1,000, (c) France Iris 320, (d) Parrot AR.Drone, (e) Smartphone. Source: Figure courtesy of Trimble (2018), Gåsemyr (2018), UIC (2012), Páli et al. (2014), Vinkó et al. (2023)