Train Pass

A trackside train pass with paired wheel clatter, rolling rail rumble and a falling Doppler whine

one-shot · 6.05 s · 0 downloads · 0 likes

0.00 / 6.05 sMP3 preview · default

Preset

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Free for commercial use. No attribution needed.

Tweak

renders in the CLI · WAV

Change parameters to build an exact command. Your agent runs it with sb and gets the WAV.

Command

$ sb get ACFYCC8JXA@1 -o train-pass.wav

Source: steel wheels on rail joints excite 2 ms filtered noise strikes; paired axles are 2.5 m apart, with two bogies per 22 m car. Continuous roughness drives a 45-850 Hz rolling bed and turbulent air.
Body: each strike excites damped 180, 470 and 1180 Hz wheel/rail bands (35-95 ms), with a low thud. A quiet 92 Hz traction fundamental and its 2nd/4th partials supply coherent mechanical pitch cues.
Motion: constant 20-65 m/s travel at 6-35 m offset; radial velocity sets c/(c+vr) Doppler ratio. Axle arrival times include propagation delay. Moving sources pan across the trackside listener.
Envelope: a 6 s approach/pass/recession, closest locomotive at 2.55 s; distributed car noise holds the peak before the rear clears. Distance darkens the roar; all layers fade smoothly by 5.95 s.
Layers: low rail rumble, mid rolling roar, high air wash and short paired clacks remain separate; no horn, brake squeal or baked reverberation. Output is high-passed at 30 Hz and limited to 8 kHz.
Variation: seeded axle timing +/-2 ms, impact strength and resonance tuning +/-3 percent. Freight is heavy and clattery; commuter is balanced; express is air-led; distant is dark and narrow.

Parameters
Parameter	Range	Default	Unit	Controls
speed	20 – 65	38	m/s	Speed
offset	6 – 35	10	m	Track distance
clatter	0 – 1	0.7	—	Joint clatter
mass	0 – 1	0.6	—	Rumble weight
air	0 – 1	0.5	—	Air wash
motor	0 – 1	0.35	—	Traction tone
seed	int	1	—	Variation, reproducible

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.

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