Amtrak Train Horn Sound
Modern Amtrak intercity diesel and electric units run Nathan K5LA — the same B major 6th chord as Class I freight. What's distinct: passenger context and route.
Amtrak train horn — royalty-free CC0 sample (BigSoundBank)
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What it sounds like
Modern Amtrak diesel and electric locomotives carry the Nathan AirChime K5LA — the 5-chime B major 6th chord that's the standard across North American mainline rail. Same chord (D♯/F♯/G♯/B/D♯), same FRA compliance, same audio character as freight.
What makes Amtrak audio recordings sound different from freight isn't the horn — it's the passenger context: the train is shorter (8–14 cars vs 100+ for freight), runs faster (up to 150 mph on the Northeast Corridor), and the horn pattern at grade crossings is the same FRA-mandated • • — •.
Amtrak fleet — what carries the K5LA
- GE P42DC Genesis (1996–2014 production) — long-haul service across the network. K5LA standard.
- Siemens Charger SC-44 / ALC-42 (2017–present) — replacing P42DC fleet on long-distance services. K5LA standard.
- Siemens ACS-64 "Cities Sprinter" (2014–present) — Northeast Corridor electric service (NYC–DC, NYC–Boston). K5LA standard.
- Acela trainsets (1st gen 2000–2025, 2nd gen "Avelia Liberty" 2025–present) — high-speed NEC. K5LA on power cars.
- F40PH-3C (legacy, retired) — older units carried K5 or K5LA depending on rebuild date.
Where to listen and download
- Train Horn Hub soundboard — synthesized K5LA chord (the Amtrak voice)
- YouTube — Amtrak horn recordings
- Freesound.org — Amtrak samples (CC-licensed)
- Zedge — Amtrak ringtones
By Amtrak service line
- Northeast Corridor (NEC): ACS-64 electric on Northeast Regional; Acela trainsets at high speed. K5LA on both. Heard from Penn Station NY to Union Station DC.
- Long-distance (Empire Builder, California Zephyr, Coast Starlight, Crescent, Texas Eagle): Siemens Charger ALC-42 replacing P42DC. K5LA standard. Heard at every grade crossing across the western US.
- State-supported corridors (Pacific Surfliner, Cascades, Wolverine, Lincoln Service, Hiawatha, Empire): Charger SC-44. K5LA.
- Acela: Avelia Liberty trainsets (Alstom). K5LA on power cars; sound is brief at high speed but identical chord.
Why Amtrak doesn't sound different from freight
The horn itself is the same — Nathan AirChime K5LA produces an identical chord whether mounted on a BNSF freight ES44 or an Amtrak Charger. What recordings reveal is context:
- Background noise: Less diesel rumble on Amtrak (smaller HEP-equipped diesels) than on a 4400+ HP freight prime mover. Electric units (ACS-64) have minimal background.
- Grade crossing speed: Amtrak passes faster (60–110 mph on most routes) — Doppler shift is more pronounced and the horn duration is shorter overall.
- Train length: 8–14 cars vs 100+ for freight; the horn doesn't "trail off" as long after the locomotive passes.
Amtrak in popular culture
The Amtrak horn appears in many travel videos, news segments, and films set on the Northeast Corridor or long-distance trains. For songs about Amtrak / passenger rail see Steve Goodman's "City of New Orleans" (covered famously by Arlo Guthrie), or the broader railway-songbook on our songs about train horns hub.
Aftermarket Amtrak-style train horns
Since Amtrak uses the K5LA, any K5LA replica reproduces the Amtrak horn voice: