We go inside the A90 car...

The car was in the use of the marshal Mannerheim from 1939 to 1946. It ran both as part of a staff train for inspections on various fronts, and as part of express passenger trains for trips to Helsinki. By the appearance of the car, you can't tell who is going inside - ordinary citizens on their own business, or the Supreme Commander-in-Chief...
Folding seats on the platforms of the carriage served, as I understand, for the guards.