Available alternative routes on which traffic can be rerouted in the case of
disruptions are vital for transportation networks. Line sections with less
traffic under normal operational conditions but with increased importance in
the case of disruptions are identified in the railway network of Hungary by
using a weighted directed graph. To describe the goodness of the individual
alternative routes the so-called redundancy index is used. The results show
that the structure of the network is good, but the lines with the highest
redundancy (lines No. 80, 2, 4 and 77 according to the numbering of the
national railway operator, M\'AV) are mostly single tracked and in many cases
the line speed is low. The building of additional tracks and electrifying these
lines while still maintaining the existing diesel locomotives for the case of
disruptions of the electric support are the keys to make the performance of the
rather dense railway network of Hungary sustainable.Comment: 8 pages, 4 figures. arXiv admin note: text overlap with
arXiv:2005.1280