Train Horns - Noise Free America: A Coalition to Promote Quiet

Noise pollution: Even the pandemic has failed to quiet Dhaka

What's With Our Train Horn Quiet Zones?

Why Is the World So Loud? - The Atlantic

Sounding the horn for grade-crossing safety

Train horns silenced at Tustin crossing – Orange County Register

Small Steps Toward Quieting Train Horns Along the New Canaan

Train Horns - Noise Free America: A Coalition to Promote Quiet

Citizens for Quiet Skies - uncensored

What's With Our Train Horn Quiet Zones?

Listening to Silence: Why We Must Protect the World's Quiet Places

New Railroad Crossing Directs Train Horn At Cars, Not Residents

Resources - Soundproofist

NPC Resources: Related Sites-- Noise Organizations (listed by area