Flat vector illustration for a modern web login page, neo-brutalist retro travel-poster aesthetic. A stylized passenger train in side profile travels horizontally across the lower portion of a vast open landscape. Extremely simple geometric forms, thick black outlines, perfectly flat colors, no gradients, no shadows, no 3D effects. Limited palette of deep navy, mustard yellow, muted coral red, and warm cream. Minimal angular hills and a few simple telegraph poles in the distance. Keep the upper 55–60% almost completely empty with a large uninterrupted cream sky for UI content. Railway tracks confined to the bottom 15–20%. Subtle paper grain texture. Strong 1960s European travel-poster influence, sophisticated editorial design, balanced composition, minimal detail, no people, no text, no logos, no lettering. 16:9 landscape.