Trains between Tbilisi and Yerevan / Baku

Hello

I am visiting Georgia in April from Ireland and researching getting trains between the neighbouring countries capitals of Yervean and Baku.

I can't find up to date train info online, with some websites suggesting Covid19 restrictions still exist.

I have my itinery for Georgia set, but can't seem to find much about the trains. Perhaps flying is easier?

Is there are something obvious I am missing?