The PTS is a Soviet tracked amphibious transport. PTS stands for Plavayushchij Transportyer - Sryednyj or medium amphibious transport vehicle. Its industrial index was Ob'yekt 65.
Introduced in 1965, it is large, with a substantial payload of 10 tons, two to four times the capacity of the BAV 485, and better cross-country performance, at the cost of somewhat higher purchase costs because it is tracked. The most common model is the improved PTS-M that is powered by a 350 hp diesel engine.
Wikipedia https://en.wikipedia.org/wiki/PTS_(vehicle)
Address 5/2 Arany János utca, Kecel 6237, Hungary
Coordinates 46°32'19.988" N 19°14'31.594" E