I include the developer part of SNFOS in the Tikiwiki
I think error in the signal page (http://simutrans-germany.com/wiki/wiki/tiki-index.php?page=fr_SignalsDef)
is_signal = 1
end_of_choose = 1
is not correct
correct is
is_signal = 0
end_of_choose = 1
end of choose is not a signal
Fixed.
Thanks for reporting.