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by brncsk 3193 days ago
I actually did this for my bachelor's thesis[1] (maps on p52-53). It's not a pure time-distance representation (constraints on angular distortion to preserve similarity to conventional maps), but anyway. Data is from railway/tram time tables.

[1] http://lazarus.elte.hu/hun/digkonyv/szakdolg/2013-bsc/baranc... (in Hungarian)