Работа с контекстом данных

 public class Station
    {
        [Key]
        public int Id { get; set; }
        [Required]
        [StringLength(30, MinimumLength = 3)]
        public string Name { get; set; }
        [StringLength(200)]
        public string Slug { get; set; }
        [Required]
        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:dd'/'MM'/'yyyy}", ApplyFormatInEditMode = true)]
        public DateTime ArrivalDate { get; set; }
        [Required]
        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:dd'/'MM'/'yyyy}", ApplyFormatInEditMode = true)]
        public DateTime CountyDate { get; set; }
 
        public virtual List<RailrouteStation> RailrouteStations { get; set; } = new List<RailrouteStation>();
 
 
    }

public class Railroute
    {
        [Key]
        public int Id { get; set; }
        [Required]
        public string Name { get; set; }
        public virtual List<RailrouteStation> RailrouteStations { get; set; } = new List<RailrouteStation>();
 
 
    }

   public  class RailrouteStation
    {
        [Key]
        public int Id { get; set; }
        public int Order { get; set; }
        public int IdRailroute { get; set; }
        public virtual Railroute Railroute { get; set; }
        public int IdStation { get; set; }
        public virtual Station Station { get; set; }
    }

public virtual Icollection<..> RailrouteStantions {get set} = ?? New list or new Icollection?

db.Railroute
// добавить join
.Include("Stations")
// тут как обычно
.GetAll().ToList();

db.Railroute
// добавить join
.Include(i => i.Stations)
// тут как обычно
.GetAll().ToList();

 [HttpGet]
        public ActionResult AddRoute()
        {
            //SelectList stations = new SelectList(eFUnitOfWork.Stations.GetAll(),"Id","Name");
            //ViewBag.Stations = stations;
            return View();
        }
        [HttpPost]
        public ActionResult AddRoute(Railroute railyroute)
        {
            if (!ModelState.IsValid)
            {
                return View(railyroute);
            }
            //SelectList stations = new SelectList(eFUnitOfWork.Stations.GetAll(), "Id", "Name");
            //ViewBag.Stations = stations;
            eFUnitOfWork.Railroutes.Create(railyroute);
            
            eFUnitOfWork.Save();
           
            return RedirectToAction("AllRoutes");
        }