According to multiple jewish sources: they invented the Refrigerated Railroad Car (1) with a jew named Isidore Kitsee being named as the person who invented it. (2)
The problem with is that a jew named Isidore Kitsee as far as I can see has never existed and no one with a similar name is mentioned in the history of the refrigerated railroad car.
The truth is that refrigerated railroad car were being experimented with as early as 1842 by the Western Railroad of Massachusetts (now the Boston and Albany Railroad) (3) then circa 1867 a man named William Davis of Detroit patented a refrigerated railroad Car to carry meat to market. Davis sold his invention to George Hammond who built and then used Davis’ refrigerator train cars to transport meat to Boston in 1868. (4)
Then in 1878 the firm Swift and Company hired an engineer called Andrew Chase to create a new ventilated refrigerator train car which was then produced by Swift and allowed them significant commercial advantage over their competitors. (5)
So thus, we can see there is absolutely no basis whatsoever for the jewish claim that they invented the refrigerated railroad car.
References
(1) For example: https://boulderjewishnews.org/2009/an-informal-list-of-jewish-inventions-innovations-and-radical-ideas/; https://jewishstandard.timesofisrael.com/when-is-a-jew-not-a-jew/
(2) https://christianislamicforum.wordpress.com/dedicated-to-our-jewish-brethren/
(3) John White Jr., 1993, ‘The American Railroad Freight Car: From the Wood-Car Era to the Coming of Steel’, 1st Edition, John Hopkins University Press: Baltimore, p. 31
(4) Ibid., p. 33
(5) Ibid., p. 45