A new Invention of The Jewish Holocaust Mythos is that They were Gassed on the Trains, but this is yet another Example of my Favourite Polish Proverb: The Jew cries out in pain as he strikes you!
The only Genocides by Gassing that Transpired in Europe, were Genocides of several White Ethnicities (though mostly Prussians) by Jews, other Arabo-Turkish, Mongoloid Turks, and Their Cohorts in The Cheka and (as it was Renamed) The N.K.V.D. The Soviet Union was Founded not by Whites but by Jews, and Dzhugashvili a.k.a. Stalin was a Georgian; an Arabo-Turkic, in the same Racial Family as Jewry.
The Inventor of Gassing Trucks (amongst the Arsenal of the Dreaded "Black Ravens"; so called because Soviet Secret Police came in the Black of Night to Abduct and Murder you) was Jew Isay Davidovitch Berg; Head of The Soviet Union's N.K.V.D.'s "Economic Division". A Cost-Efficient Genocide will Enable more to be Murdered.
No Exotic Gases (like Sarin or VX) nor Weaponized Zyklon B (a Common Pesticide; still Manufactured today, under another Name) needed to be used to Achieve Genocide; merely a rubber hose with one end in a stuffed tailpipe and the other inside what thus became a Mobile Gas Chamber.
The Bodies were Buried in Katyn Forest, along with those Shot there and/or Buried Alive. Though America Blamed "Nazis", Forensic Analysis has Proven it was Soviets. Yevgeny Dzhugashvili, Stalin's Gypso-Georgian Grandson (just as his Sons and Wives were, though one Wife had Admixture with German and Russian), has Sued a Duma (one of the Legislative Assemblies in Russia) for 100,000,000 Rubles (about 3.3 million U.S.D.) for Admitting this.
Other Gassing Genocides did Occur in WWII, but these were by Japanese Soldiers under Dr. Shiro Ishii in Manchuria; Victims were Chinoid and Russian Civilians.
The Russians had not Genocided the Japanese, though The Soviet Union had Planned to Invade; the Troops would have been Multi-Racial, and the Whites (Russian or otherwise) would have been - as they were elsewhere - Coerced.
The Chinoids, on the other hand, Genocided Japanese Civilians in China; some say The Rape of Nanking (20,000 Reported Victims) was Retaliation, whereas others say it was a Hoax to Distract from the earlier Mass-Murder of 30,000 Japanese Civilians.
America actually Severed Japan's Oil Supply Specifically to Prevent a Preemptive Strike on The Soviet Union by The Aryan-Yamato Alliance, and Franklin Delano Roosevelt a.k.a. Rosenfeld a.k.a. Rosenvelt (also Marrano Jewish via his Delano Lineage, as well as Jewish by his Kunst Lineage) actually had Foreknowledge of the Impeding Attack on Pearl Harbour; he was Alerted by Duško Popov. Popov had been sent by Guy Liddell; an Associate of Members of the Jew-Recruited Cambridge Apostles Conspiracy. America's Official Response is that Popov had Warned the Wrong Office, though there was no Effort to Relay this Intel.
This Crippling of Japanese Industry, after Jewish and Jewish-Directed Forces had Ensured the Industrialization of East Asia, also Aided China; which had been the Subject of Jewish Financial Interests since The Opium Wars. Before and after the so-called Sino-Soviet Divide under Dzhugashvili and Mao Zedong, there were and still are several Influential Jews in China. Today, the Chinese are perhaps the Main Protégé of Jewry.
After Allied Victory in Japan, America Protected Ishii from Prosecution by a War Crimes Tribunal, though it Tortured Whites into False Confessions in Europe, in Exchange for Bio-Weapons Research that would be used in The Korean War. America Ousted Japan from Korea, thirty-five years after it Aided it in said Conquest, in order to Facilitate said Proxy War with The Soviet Union. This Fed The Propaganda Machine, as if the two were not both under Jewish Control.
Meanwhile, The Soviet Union Plundered Japan's Nuclear Program. Much of the Uranium and all of the Plutonium had been Supplied by Germany, as had Instructions on the Physics of Nuclear Science, after its Heavy Water Plant in Norway was Destroyed by America.
Jodle's Surrender and Order that all U2 do the same, Ensured that America's Nuclear Weapon's Program - rather than Japan's - would Prevail. There is a Rumor, however, that Japan actually Tested The First Successful Nuclear Bomb in North Korea.