21 RIV MC  44 BHÉV  2135004-9 •Hbcgrs, Maribo/DK 22.06.1974 © Per Topp Nielsen
In the boxes below the ends you will notice the stored shutters for the doorways when open - see photo below
  

21 RIV MC  44 BHÉV  2135003-1 •Hbcrs, Szentendre 25.06.1990 © Per Topp Nielsen
Here you see the above mentioned door shutters in use