So far, only one train car has a Plexiglass divider with most cars being loaded as normal with social distancing. Unfortunately, we weren’t seated in the car with Plexiglass, but we did catch glimpses of it behind us.
There’s only one divider between the rows in the second car of a train.
With the apparent success of Plexiglass on Star Wars: Rise of the Resistance, we expect to see more dividers added to Mickey & Minnie’s Runaway Railway in a few weeks. The dividers could allow two parties to share one car, therefore raising the attraction’s capacity.