Leave the painting
on the train. Those lost property officials will know what to do with it.
Take the painting
back to your hotel with you.
The train seems to take an age to arrive, during which time two thugs armed with big knives run onto the platform. You step smartly into a carriage the moment its doors open; hopefully, the hoods won't have noticed. Certainly you aren't bothered as the doors finally close and the train pulls away.
A sneak look inside the package reveals that it contains an eerily lifelike portrait of mad Nazi dictator Adolf Hitler.
A few minutes later, the train pulls up at your stop.
You can:
Leave the painting
on the train. Those lost property officials will know what to do with it.
Take the painting
back to your hotel with you.