## 3 Utilization of Reflective Thermal Insulation Coatings on Railway Tracks Abroad
In Figure 6a, the railway tracks are shown before the application of the thermal insulation coating. The provided rails were affected by corrosion, which had to be removed before the actual application of the reflective thermal insulation coating. The removal of corrosion was conducted using an electric grinder along the all 9 m length. Figure 6b shows the rail surface before and after cleaning. The cleaning and application were carried out manually and took two days to complete. After the application of the coating, temperature measurements were conducted over a period of 1 to 5 days. Days with high temperatures were selected for the measurements (Table 1). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & & & & **Railway Track** & & \\ \hline \multirow{2}{*}{**Day**} & \multirow{2}{*}{**Date**} & \multirow{2}{*}{**Time**} & **Ambient** & **Temperature of the Railway** & **Temperature of the Railway** & **Temperature** \\  & & & **Temperature** & **Track without Coating** & **Track with Coating** & **Difference** \\  & & & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) \\ \hline
1 & 2023-08-11 & 13:21 & 27.1 & 40.3 & 35.2 & 5.1 \\
2 & 2023-08-12 & 12:00 & 24.7 & 44.4 & 28.8 & 15.6 \\
3 & 2023-08-16 & 13:18 & 30.4 & 51.5 & 36.8 & 14.7 \\
4 & 2023-08-17 & 13:10 & 32.5 & 51.5 & 35.7 & 15.8 \\
5 & 2023-08-18 & 13:50 & 33.2 & 53.5 & 38.7 & 14.8 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The summarized data from the railway track measurements. After the removal of corrosion, it was necessary to apply a base primer (RustPrimer), to protect the railway track from unwanted corrosion. Once the base primer had sufficiently cured and dried, the thermal insulation coating (IndustrySpecial) was applied to the railway track in two sprayed layers. Figure 7 shows the final coating of the test rail. The temperature of the tested rail was measured over a period of 5 days using the non-contact infrared thermometer, Fortum 4780401. The thermometer is suitable for the non-contact measurements of surface temperatures of objects in a temperature range from \(-50\)\({}^{\circ}\)C to +800 \({}^{\circ}\)C with a resolution of 0.1 \({}^{\circ}\)C and a measurement accuracy with an uncertainty of 1.5 % from the measured value +2 \({}^{\circ}\)C.  
Figure 7(a) captures a measurement of a railway track that does not have a thermal insulation coating applied. The measured rail temperature was 51.5 \({}^{\circ}\)C. Figure 7(b) captures the measurement of a rail that has an applied thermal insulation coating. The measured value of the rail temperature was 35.7 \({}^{\circ}\)C.  
Figure 6: Test rail before the coating application: (**a**) general view of sidetrack in Zilina Railway Station; (**b**) detail of the corroded and ground sections of the test rail. Figure 7: Test rail after the coating application: (**a**) general view of sidetrack in Zilina; (**b**) detail of the test rail with coating. The summarized data from the measurements from different days are provided in Table 1.  
Table 1 shows a record of the temperature measurements that were carried out on the rails. On the first day of measurement, the temperature difference was low, only 5.1 \({}^{\circ}\)C. The temperature difference was caused by the fact that the rail was only coated with RustPrimer and not with IndustrySpecial's definitive thermal insulation coating. It can be seen that the primer alone was able to reduce the temperature of the rail by 5.1 \({}^{\circ}\)C. The other measurements were recorded after the final coating of IndustrySpecial was applied. of both the internal and external temperatures and relative humidity were conducted. The external temperature on that day was 30.3 \({}^{\circ}\)C. The external wagon surface temperature was measured in two parts of the railway wagon, the roof and the wall, by the non-contact infrared thermometer.