LED letters on buses

This week, me and my family have rented a house in the Stockholm archipelago and I've been commuting back and forth to work using buses I don't normally go with (670 and 603 to be precise).

In many of the Stockholm buses there's a rather big LED-display situated in the ceiling in the front and often somewhere in the middle of the bus, normally displaying the route number and end station and at each stop it displays the name of it while a recorded voice reads out the name of the stop in the speaker system.

While sitting there I noticed how it would display "Pülsundsvägen" instead of "Pålsundsvägen" (that is with a German letter ü instead of the Swedish letter å) but I didn't think much more of it then.

LED display

Another day I happened to go with a complete different bus through a different area and yet again I noticed how the display used the ü instead of å while the recorded voice used the letter å and I was convinced someone in the bus company must've bought a German system or similar and very strangely got satisfied with this very strange-looking graphical choice of letters. The fact that ü was chosen is funny, since we're kind of used to simply use a in Sweden when å isn't available. I also find it funny that so few people seem to mind.

This morning on the bus when I decided to mention my recent findings to a friend, I was shocked... now this bus actually showed å just like it should.

This makes me so puzzled. Was I only dreaming? Do they use different displays/drivers in different buses? Did they do a software upgrade exactly this week that is removing this flaw?

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