Train departure sound event:
fzn:station.depart

Alias:
fzn:station.traindepart

Closest player, locked to the target player:
execute positioned 100 64 -200 as @a[distance=..35,sort=nearest,limit=1] at @s run playsound fzn:station.depart voice @s ~ ~ ~ 1 1 1

Proximity broadcast from station:
playsound fzn:station.depart voice @a[x=100,y=64,z=-200,distance=..35] 100 66 -200 2 1 0
