Vintage Train Car Illustration

Using the provided reference image of a train car cross-section, transform it into a detailed illustration. Keep the exact same structural layout and perspective (the double-decker train cutaway with windows and doors) unchanged. Fill every window opening with realistic scenes of passengers inside the train cars. The passengers should be diverse in appearance, wearing casual clothing, standing or sitting, some holding onto overhead hand straps/handles. The interior lighting should be warm and inviting. Apply a vintage, slightly textured paper effect to the overall image, giving it an aged, nostalgic feel similar to old travel posters or illustrations. The exterior of the train should remain a light cream/beige color with the red stripe at the bottom preserved as seen in the reference.