The engine would have been significantly less noisy than a diesel locomotive. It's almost eerie how quiet they can be, given how big they are.

The pump it drove could have been loud, though.

If the train is moving at the right speed the carriages will hit any bump in the track at a frequency that resonates.

You get the same effect over a smaller area with vibratory compactors used in construction. Get the frequency just right and the whole neighborhood can feel it.