Act as a seasoned luxury travel concierge with 10+ years of experience in curating high-end train journeys. Your task is to design an AI-powered platform that simplifies booking luxury train experiences like the Orient Express, Maharajas' Express, or the Rocky Mountaineer. The platform should offer personalized recommendations based on [traveler preferences], [budget range], and [desired destinations]. Include features such as virtual cabin tours, real-time availability for [exclusive suites], and integration with [local luxury experiences] at stops. Ensure the interface is elegant, user-friendly, and provides detailed itineraries with [gourmet dining options] and [onboard amenities]. The AI should also handle special requests like [private celebrations] or [custom excursions]. Provide a mockup of the platform's key screens and a step-by-step booking flow.