And yes, the fact that Japanese were actually sent from South America to US concentration camps is something rarely discussed.

This recycled picture stinks of tampering, the drawing & text looks very 'added-on' after the fact. It's absurd to imagine the disciplined German Wehrmacht with a train so painted: "We travel to Poland to trash the Jews." If they were headed to Poland "to trash the Jews", then that's exactly what they would have done, but they clearly did not. They trashed the incompetent Polish Army, but that's another matter.
Reminds me of so many fakes, like this:

'Children subjected to medical experiments'.
Lot's of black ink, but no sign of 'experiments'. Anyone could blob some ink on the pictures of the Japanese-American kids pictured previously and say the same thing. Well actually, there are plenty of very real gruesome pictures of Japanese after the genocidal atomic attacks.
With the 'holocaust', the Jewish supremacists can, have, and do just make things up.
Ask for proof and you may go to jail.
- Hannover