Franciszek Ząbecki  Lieutenant Franciszek Ząbecki (8 October 1907 – 11 April 1987) was a station master at the village of Treblinka. During the German occupation of Poland in World War II, Ząbecki worked as a dispatcher for the "Deutsche Reichsbahn"; he also became a secret soldier in the underground Armia Krajowa (AK), collecting classified data and reporting to the Polish resistance on the Holocaust transports that went to Treblinka extermination camp. Over 800,000 Jews were murdered there in the course of Operation Reinhard, the deadliest phase of the Holocaust in Poland. Ząbecki himself estimated that number to be 1,200,000 people. After the war, Ząbecki testified at the trials of German war criminals, including "SS" officer Kurt Franz, and the commandant of Treblinka extermination camp, Franz Stangl. His incriminating evidence against them included original German waybills , which proved that the "Güterwagen" boxcars crammed with prisoners on the way to Treblinka extermination camp, were returning empty. Ząbecki secretly stole a batch of waybills in 1944 from the control house to serve as physical proof of the ongoing extermination program. From July 1942 until the end of war, Ząbecki regularly delivered his reports about the Holocaust trains to the Polish government-in-exile. Franciszek Ząbecki was born in Łyszkowice to Rozalia and Franciszek Ząbecki, as one of their four children. After graduation, he worked for the railway between 29 September 1925 and 15 October 1929 in Bednary near Łowicz, first as an apprentice and then as the radiotelegraph operator. Ząbecki was drafted to serve at Zegrze Fortress from 15 October 1929 until 1 September 1931. Soon later, he relocated to Sokołów Podlaski, where his older brother Grzegorz worked at a sugar refinery. Franciszek found employment as a tax collector and got to know the locals. On 4 September 1939, during the German invasion of Poland he reported to the Communication Battalion of the Polish Army in Zegrze as the reserve ("plutonowy"). Two weeks later, on the first day of the parallel Soviet invasion of Poland from the east, he was arrested in the village of Kołodno near Zbaraż and shipped to a Soviet POW camp.