"Train Horn" like synth pad
By - tln1337
It'll be a 7th chord. Dissonance is the goal for freight trains. Diminished 7ths are used. Amtrak uses a K5LA horn, which is D#, F#, G#, B, and D#octave. Although this sounds like a freight to me.
Yeah the other guys got it right it’s a chord and that’s why it sounds like a train horn. Pitching it up then down slightly makes it sound like it’s passing by.