During research for the rare ETAP device and the Ericsson connector, I found this computer, first only poor b&w photos in the Swedish Elektronik magazine. I now found this color photo from a PDF originally from the LM Ericsson Review magazine. Some more photos (like control rooms with interesting keyboards) and English text there. This 1978 installation controlled Swedish railway yards. Computer might be much earlier
Some more photos and English text there
https://www.jonroma.net/media/signaling/articles/ericsson/L.%20M.%20Ericsson%20Review.%20Computer%20Controlled%20Interlocking%20System.%20Andersson%2C%20Hans%20S.%201981.pdf
A nice blue control panel at a museum here