On 20 Oct 2026, on the Havířov/Karviná/Orlová sheet, the owner said: "Do much better please - e.g. 501 is the only line running to Dětmarovice, how can we not model that?" The per-terminus-pair branch rule had dropped every sparse or one-way leg. That left out Dětmarovice, Hradiště, Stonava and Důl Darkov, and it reduced 505's rotating bus and the 401/406 ring to wrong shuttles.

Why: the owner builds the network in the game from the sheet. A place that no Simutrans line serves is simply missing, however few trips it gets.

How to apply:

• Before publishing any bus sheet, run a sheet-wide stop coverage check: every stop served 13:00–19:00 must be on some modelled Simutrans line, or be listed with its reason.
• Also list, per card, the trips that are not on any of the line's Simutrans lines.
• Lines whose buses rotate through branches, or that are halves of a ring across two line numbers, get a hand-set circuit (line_overrides, Ostrava 41 precedent).
• Sparse unique branches of REGIONAL lines: no every 1440/720 any more (owner, 20 Oct); use the repeating interval ≤ 480 (bus-schedule-method v3). Local city lines: only afternoon peak + unique stops; off-peak single trips are listed, exceptions asked (see regional-vs-local-rules). Depot runs never.
• Keep one Simutrans line per real line. Offer pooling as an option, but don't pool silently.

Reference implementation: pipeline/havirov-karvina-orlova (04_roster step 7, lib.build_overrides). Related: havirov-karvina-orlova-bus, find-every-train-feedback, model-line-at-its-peak.