Trmperature control panel.
https://assets.chaos.social/media_attachments/files/112/996/603/762/503/996/original/22f90363a91a9366.jpg
Control panels next to the head rests allow you to set the air temperature, and the volume of the announcements.
Sadly, the other "music channels" are silent. You can also set the ceiling lights to bright, dim, and off. Very handy.
I also have been granted the power to summon a train attendant! Haven't used it yet.
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