Further to my last posting - the man that the cover is addressed to was Hungarian, Mr. Izod.
I did get information that this man was interned because it was believed he had nazi sympathies. This was later proven to be untrue and he was eventually released. He had in fact fled Hungary to get away from the government of the time that had sympathy towards the nazis.
The number trainwreck referred to was a serial number he had while interned - as far as I know.
I don't know why I didn't scan this earlier but I also have another card from the same people but with a different camp cancellation.
Later, I will try to dig up information on the camp itself.
Chimo
Bujutsu

The sender of this cover is again Dr. E. J. Christian Otvos.