Open
Assets\RSC\P42Pack01\Audio\RailVehicles\Diesel\P42DC\Cab\P42DC_Horn.proxybin in RW-Tools.
Look for these two lines:
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<kLoud-cSingleSampleSound d:id="25318">
<Name d:type="cDeltaString">Horn</Name>
These mark the beginning of the xml node for the Horn loop sound.
A little lower are these two lines:
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<AttenuationStartDist d:type="sFloat32" d:alt_encoding="0000000000005940" d:precision="string">100</AttenuationStartDist>
<NoFutherAttenuationDist d:type="sFloat32" d:alt_encoding="000000000040AF40" d:precision="string">4000</NoFutherAttenuationDist>
This says that, as long as you stay within 100 meters of the engine, the sound will remain at full volume. It will start decreasing at 100 m, until you reach 400m, at which point it won't decrease any further.
These values are pretty much standard.