public static List <List <Locomotive> > GetAllLocomotivesByStation(List <Station> stations)
{
List <List <Locomotive> > locomotives_by_stations = new List <List <Locomotive> >();
foreach (Station station in stations)
{
List <Locomotive> locomotives = Locomotive.GetLocomotivesByStation(station.station_id);
locomotives_by_stations.Add(locomotives);
}
return(locomotives_by_stations);
}