RAINLINE | Rainy Night Train Window

Synthesized procedurally with local tools (numpy generation, ffmpeg/libmp3lame encoding, nothing installed). One file delivered.

File: RAINLINE-rainy-night-train-window.mp3 | 320 kbps CBR | 48 kHz | stereo | 24.0 s

Sound design (all synthesized noise and sine tones, no samples)

• Near: light rain on the window, about 820 separate drop transients (1–16 ms decay with 2.4–9.5 kHz glass overtones), 80 sliding streaks and a very thin 3.2–15 kHz mist layer.
• Middle: 28–115 Hz rail rumble with a wheel rhythm about every 1.2 s (5 dB less below 45 Hz so it stays light), a faint 95–340 Hz carriage resonance and 16 sparse, very quiet 1.1–4.2 kHz metal ticks.
• Far: one chime at 10.6 s (587 Hz with inharmonic partials, 6 ms attack, 2.8 s decay) with three weak reflections at 95/190/310 ms, panned slightly left; no melody, no voice, no announcements and no real station names.

Measured on the decoded MP3

Fades and looping: 0.25 s raised-cosine fades at both ends. The noise bed is built with circular (FFT) filtering, so it is continuous across the seam; with the fades kept, the loop point is a very light breath rather than perfectly seamless. For a tighter loop, shorten the fades to 0.03–0.05 s or use a crossfaded version.