namespace DefaultNamespace
{
    public abstract class Factory<T>
    {
        public abstract T Create();
    }

    public abstract class TransportFabric<T> : Factory<T> where T : ITransport { }

    public class TruckFabric : TransportFabric<Truck>
    {
        public override Truck Create()
        {
            return new Truck();
        }
    }

    public class CarFabrick : TransportFabric<Car>
    {
        public override Car Create()
        {
            return new Car();
        }
    }

    public interface ITransport { }
    public class Truck : ITransport { }
    public class Car : ITransport { }

    public class Foo
    {
        private ITransport _truck;
        private ITransport _car;

        public Foo(TransportFabric<Truck> truckFactory, TransportFabric<Car> carFactory)
        {
            _truck = truckFactory.Create();
            _car = carFactory.Create();
        }
    }
}