C#

public abstract class Transportation{
    public abstract void DoThat();
}
public class Air{
   ...
}
public class Vessel{
   ...
}

public abstract class Transportation
{
 
   public abstract void DoThat();
}
public class Air: Transportation
{
   ...
}

public class Vessel: Transportation 
{
   ...
}

abstract class TransportationMedium
{
    // Common transportation medium functionality and data here
    abstract string Name { get; }
    abstract void Transport();
}

class Vessel: TransportationMedium
{    
    // Extend common stuff from base
    override string Name { get { return "Vessel"; } }

    override void Transport()
    {
        // Vessel-specific transport implementation
    }
}

class Air: TransportationMedium
{
    // Extend common stuff from base
    override string Name { get { return "Air"; } }

    override void Transport()
    {
        // Air-specific transport implementation
    }
}

class Land: TransportationMedium
{
    // Extend common stuff from base
    override string Name { get { return "Land"; } }

    override void Transport()
    {
        // Land-specific transport implementation
    }
}

static class TransportationMediumFactory
{
    static TransportationMedium Construct(int typeID)
    {
        switch (typeID)
        {
            case 1: return new VesselMedium();
            case 2: return new AirMedium();
            case 3: return new LandMedium();
        }
    }

    static TransportationMedium Construct(string type)
    {
        switch (type)
        {
            case "Vessel": return new VesselMedium();
            case "Air": return new AirMedium();
            case "Land": return new LandMedium();
        }
    }
}

class Program
{
    void Main()
    {
        int mediumType = 0;
        string intput;

        Console.Write("Select medium (1=Vessel, 2=Air, 3=Land): ");
        input = Console.ReadLine();

        mediumType = Convert.ToInt32(input);

        TransportationMedium medium = TransportationMediumFactory.Construct(mediumType);

        Console.WriteLine("You chose " + medium.Name + " as your transportation medium.");
        
        medium.Transport();
    }
}