I did take the car apart and there is openings in the ceiling to allow light in the dome. The problem is that the there are to few light in the car, to illuminate the dome. When I run the cars, I can't tell if the lights are on, unless I shut off the lights in the room. It looks like there are a total of 3 light for the whole car.
After waiting for a year for the cars, I'll keep them, but I cancelled my per orders for other road names and would be per ordering the Union Pacific like I planed.
Between the domes, the color of the cars not matching the engines, lack of lights and passengers, the truck and sling shot couplers, I would send it back, but I don't want to wait to see if someone else will make the blue bird, let alone wait for it to be produced after being announced.