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diff --git a/known-bugs.txt b/known-bugs.txt
index 80717c4b0..f6651c8e6 100644
--- a/known-bugs.txt
+++ b/known-bugs.txt
@@ -321,3 +321,16 @@ Unreadable characters for non-latin locales [FS#4607]
blitter has been selected, e.g. blitter = "32bpp-anim", as with the
8 bits blitter there are not enough colours to properly perform the
anti-aliasing.
+
+Train does not crash with itself [FS#4635]:
+ When a train drives in a circle the front engine passes through
+ wagons of the same train without crashing. This is intentional.
+ Signals are only aware of tracks, they do not consider the train
+ length and whether there would be enough room for a train in some
+ circle it might drive on. Also the path a train might take is not
+ necessarily known when passing a signal.
+ Checking all circumstances would take a lot of additional computational
+ power for signals, which is not considered worth the effort, as
+ it does not add anything to gameplay.
+ Nevertheless trains shall not crash in normal operation, so making
+ a train not crash with itself is the best solution for everyone.