Examensarbete (VTI)

There is currently significant ongoing research on how to efficiently operate low-density regional railway lines, along with interest from governments in refurbishing old and abandoned railways. This Master’s thesis explores potential solutions in railway signalling, vehicle propulsion, and autonomous train operation for these lines, specifically using the 9.6 km long Vadstena-Fågelsta railway line in Sweden as an example. The line is isolated from the mainline by its narrow gauge and serves currently only for museum purposes. The thesis employs a case study approach with elements of exploratory study and action research, involving stakeholders to incorporate their requirements and feedback. The findings suggest that renewing train operation between Vadstena and Fågelsta with two shuttle trains could shorten commuting times for approximately 500 or more people daily by about 8 minutes, and reduce the number of buses needed in the area by 3 or 4 vehicles. The capital expenditures for such reconstruction can be quite high, so to make it cost-effective, modern non-interoperable signalling solutions, such as a system based on Positive Train Control with few line-side components and cabling, are recommended. Additionally, a tram-train solution, where the line would operate as a tram in Vadstena, is advised for initial cost savings. Battery or supercapacitor propulsion is found to be the most advantageous for this short line, being both ecologically beneficial and cost-effective. Potential self-driving capabilities could further reduce operational expenditures significantly. Combining these solutions could revitalize the specific area along the Vadstena-Fågelsta track and effectively reuse old infrastructure while providing opportunities for future research, and possibly utilizing this line as a test track. The findings of this thesis are also generalized for other regional lines.