A railway junction is a critical element for a reliable rail transport operation. In the planning process of railway interlocking and signalling on a railway junction, a consistent assessment and choice of the most appropriate technology is both the need and a challenge. An outcome of such assessment shall provide a solution to safe, efficient and secure train movement over the railway junction. This paper discusses an evaluation method which has been developed for a single, bidirectional railway junction and elaborates on its implementation aimed at obtaining a railway junction signalling system cost-benefit chart, functions processing chart and functions cost chart.