public static string[] GetLineShortNames(this LuasLines stopList) => stopList.Line.Select(x => x.Name.Split(' ') .Skip(1) .FirstOrDefault()) .ToArray();
public static int GetIndexOfShortName(this LuasLines stopList, string shortName) => Array.IndexOf( GetLineShortNames(stopList) .Select(x => x.ToLower()) .ToArray(), shortName.ToLower());