User caught it on 18 Oct 2026 ("solo trams are not working on line 7"; "1359 … highly likely it was 2 Varios coupled. Make sure your research is correct"). The Ostrava sheet had put single Vario LF cars on 4, 7 and 8. Their history came from 9xx evening courses (out to the night lines 18/19), and the roster code had split coupled pairs into singles. In the day records, 1359 ran as 1360 + 1359.

Why: a weighted type share mixes all-day records; evening and night runs use different (short) vehicles than the 16:00 peak. How to apply: for any city, before trusting a type on a line, look at the raw records by course group and by single vs coupled. Leave out evening and night course groups. Never collapse a recorded coupled pair to a single. When correcting a published sheet, rebase on it and swap only the wrong units (Ostrava 04b_rebase.py), since the owner has already built those trams in the game. Coupled pairs do run, e.g. on Ostrava 1/2, so keep them where the records show them. Related: ostrava-tram-vypravenost, designed-vehicles-roster-rule, prague-tram-peak-fleet