Edit: it does (https://www.seat61.com/international-trains/trains-from-Lisb...), just that the country's not listed where I expected it to be.
I vastly prefer taking the train from Lisbon to Porto for business, since I can work and prepare during the trip, with the following caveats:
- Mobile data coverage along that particular line is spottier than a cheetah, with more gaps than a croc's denture and slower than snails. On-board Wi-Fi is even worse.
- For some reason CP (the Portuguese train company) refuses to service the power outlets on 1st/2nd class cars, which means it's a toss-up as to whether you'll have enough battery to work on the train.
This has been going on for years, but I still prefer taking the train to a cramped (and noisy) flight.