I can't believe we're still discussing USB ports. This is not Amtrak. The use case is completely different and the clientele are vastly different. You're on this train for 5-45 minutes. It is completely pointless. Furthermore, you're in a rail car where people are constantly moving around, pushing forward and back, squeezing in, etc. Which makes it impractical. Furthermore, the only people would could practically make use of it are the few people who are sitting in a seat, and only the one in the seat along the wall. So in this entire car full of 100 people, only a small fraction could even bother to try using them. Making it even more pointless. And yet even furthermore, the ports will be destroyed in the first few months due to abuse, vandalism, or being pushed into/bent by the other 90 people on the train that can't use them. They will never be repaired or maintained.
It would be a ludicrous waste of money.