TubeHeirloom Lineage

Metro memories scatter into half-recalled platforms and vanishing transfer notes. This vault exists so explorers can keep each underground network as a nested lineage of systems, lines, stations, visits, and descriptive findings—so what you learned in one city still sharpens the next descent. Capture architecture mood, era bands, signage character, and transfer grain as notes you can revise without breaking the research chain. Surface corridors never ridden, stations never described, and wishlist platforms waiting for their first documented episode. Split two networks edge to edge, watch visit density pulse across your threads, and shelve dormant systems until curiosity pulls them back onto the platform.