## 5 Conclusions  
This paper presents a novel approach to managing partially or fully decommissioned railway stations using a SCADA-GSM system. The proposed method aims to ensure the electricity supply system, prevent system failures, reduce train traffic, and improve the overall efficiency of railway transportation.  
To ensure the security of the SCADA system, the authors propose defining their own protocols for both transmission and reception. They use the advanced encryption standard (AES) method, with a shared secret key that utilizes the remaining bits (256 bits). The payload is encrypted by concatenating the command, secret key, and OTP into a single string, as the initial stage. The architecture of the control system is modular, and consists of three functional levels: the control level, the supervision level, and the execution/signal level.  
To test the efficacy of the proposed method, the authors chose the Brasov-Codlea route, which has two partially decommissioned stations, Bartolomeu and Ghimbay. Data were analyzed for both passenger and freight trains, and the results showed an 80.07% reduction in total delay time. This reduction in delay time would significantly enhance the efficiency of both passenger and freight transportation on the studied rail segment and generate a potential annual benefit of more than 36 million Romanian Leu.  
The proposed system's scalability, makes it easy to integrate into existing control systems, or those under construction, and to adapt to changes in train traffic. This approach addresses the need for increasing the safety and security of critical infrastructure, and helps bring Romania closer to a fully compliant railway network.  
Conceptualization, A.-F.P. and S.-A.M.; funding acquisition, S.-A.M.; investigation, A.-F.P.; methodology, A.-F.P., D.M.K., D.-V.B. and M.-A.Z.; visualization: D.M.K.; resources, S.-A.M.; software, A.-F.P., D.-V.B. and M.-A.Z.; supervision, S.-A.M.; writing--original draft, A.-F.P., D.-V.B., M.-A.Z. and S.-A.M.; writing--review and editing, A.-F.P., D.M.K., D.-V.B., M.-A.Z. and S.-A.M. All authors have read and agreed to the published version of the manuscript.  
**Funding:** The Article Processing Charge was reimbursed by the Transilvania University of Brasov (Brasov, Romania) under decision nr. 1/2020, the registration number of this paper being 4223/04.04.2023. The publication fee of the article will be reimbursed according to the decision of the Transilvania University of Brasov's Board of Administration, no. 11 of 2 September 2020, point 10, paragraph d).  
**Institutional Review Board Statement:** The study was conducted according to the guidelines of the Declaration of Helsinki. Ethical review and approval were waived for this study, because, since it was an observational no-clinical study, it was not mandatory.  
**Data Availability Statement:** The data presented in this study are available on request from the corresponding author. The raw train traffic data are not publicly available, due to internal confidentiality guidelines set by the railway company CFR SA.  
**Conflicts of Interest:** The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.