Ensuring an appropriate level of transport accessibility of peripheral areas is one of the greatest challenges of regional and local policy. Higher accessibility has a positive impact on the attractiveness of a given area as a place to live and creates favourable conditions for running a business. An example of a region located peripherally and at the same time problematic in the socioeconomic sphere is the Jelenia Góra agglomeration. The aim of this article is to examine the validity of implementing urban rail in the functional area of Jelenia Góra and to determine the scope of its operation as part of shaping sustainable mobility in the Karkonosze subregion. A crucial part of the work is the original concept of the ‘Karkonosze Light-Rail’, which is a reference to previously published plans of the Jelenia Góra agglomeration railway.