The Hoosac Tunnel reopened on 4/4/20. Video of the first train at the East Portal:
https://www.youtube.com/watch?v=74uQ4SKKTQE
That was day before yesterday and I heard the train ( here in North Adams) but thought it another local as there have been several during the shutdown.
A long Eastbound just rolled up the valley headed for the West Portal so it looks like a slow resumption of traffic.