According to these two entries, signals should have maintenance costs.
QuoteRevision: 11648
Autor: ceeac
Datum: Sonntag, 2. März 2025 09:43:38
Meldung:
ADD: Maintenance costs for roadsigns and signals
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Verändert : /simutrans/trunk/simutrans/history.txt
Verändert : /simutrans/trunk/src/simutrans/descriptor/reader/roadsign_reader.cc
Verändert : /simutrans/trunk/src/simutrans/descriptor/writer/roadsign_writer.cc
pak64.german 0.124.0.0.6 (https://simutrans-germany.com/wiki/wiki/article285-unofficial-pak64-german-0-124-0-0-6)
Quote- ADD: roadsign maintenance
However, the maintenance costs are not displayed in the tooltip or in the finance window.
Sorry, forgot to commit the patch that contains the logic for booking sign/signal maintenance. Should be fixed in r11756.