I have a lot of trains, and the warning would be very useful, but due to having a lot of trains it's entirely useless as it doesn't tell me at all which route was problematic. Any chance at all of the warning including a station name?
Thanks for the report. Should be fixed in the latest update. Not sure why it printed 3, but now it will show Temporary [x,y], because that is what the station was.
Also, i think absent a useful string to interpolate into the message, i think it parsed and injected the station name placeholder __3__ as some form of concatenation of the placeholder id.