A bit more than that. And old freight trains are loud, even when empty.

Another example, there is a small local passenger train with a combustion engine. Very loud, whether slow or fast. Unlike the mentioned modern electric one from Alstom, who are so silent, that they are dangerous when they pass by a train station and you are too close to the track. You only notice them moments before they wooosh by.

And if you want more than my anecdota of everyday experience, there are tons of youtube videos of different trains to see that trains can be loud, if that was not a manufacturing concern, or silent. Usually, the older the louder.