Is this a Bridge or Tunnel?

When evaluating whether to map an underpass as a tunnel or the feature that runs atop as a bridge, where would you draw the line?

I was looking at this railroad underpass and to me it seems like a bridge since the railroad looks like it is being carried on a structure.

How would you map this situation and where is a tunnel really a bridge?

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/is-this-a-bridge-or-tunnel/110535