Ключевые слова: again, blocked, chaos, city, closed, conditions, cover, covered, delay, disrupt, disturb, freeze, intense, interrupt, kalkbreite, line, operation, public, schweiz, seasonal, service, severe, snow, snowcovered, snowfall, snowy, station, stop, street, suisse, switzerland, timetable, town, track, traffic, tram, tramway, transport, transportation, urban, weather, winter, wintertime, wintery, wintry, zurich,