Mr. Lensovet, your comment regarding "stargazing" from the Parlour Car reminded me of a few anecdotes regarding Dome Cars during the railroad era.
The Baltimore & Ohio closed their Domes between Wash and Silver Spring; apparently they were concerned about the possibility that on a rainy day, someone could gat zapped, or at least scared, should there be an arc between the PRR wires and the Dome.
when the "who needs Domes" Southern Pacific took the California Zephyr as a detour over Donner Pass, the Domes were off limits as they feared potential liability from a timber falling inside a snow shed and cracking the Dome. Apparently this was not of concern to them with their half height Dome Lounges. They prohibited Amtrak from assigning short Domes to the Zephyr until they and Amtrak signed an Amended Agreement during 1974 regarding assumption of liability; then they didn't care.
But the best of restricted Dome use was on the Union Pacific. At about 10PM, the Coach Dome was off-limits until Sunup, for the good Mormons whose grandfathers worked to build the railroad were expected to sleep in their seats - and not "at the Drive In movie in a Nash Rambler".