World Train Map is, by design, a curated map of interesting passenger trains, not a comprehensive map.

The problem with every comprehensive map I've seen is that they are way too comprehensive. If you look at Congo on https://www.openrailwaymap.org/, you might assume the country has a functional passenger railway network, when almost most lines shown were for bulk cargo only, fell into disrepair in the 1960s and certainly haven't had passenger services in decades if ever. Even for first world places like Australia there are tons of supposedly "main lines" listed that are nothing of the sort.