2ТЭ121 mainline diesel-electric locomotoves were developed in mid 1970s as more powerfull model followed 2TE116 having two 3000 hp diesels. It traditionally composed of two sections but have many progressive elements as frame support of traction motors, the load-bearing body with new 4000 hp / 2942 kW diesel 2В-5Д49 (16ЧН26/23), increased wheel size (1250 mm) and high wheel loading (up to 27 t). After bogie model developed for improved 2TE10V locomotive and used later in 2TE116 with diagonal link arm primary suspension and only helix springs designers returned to more complex variant very like to the used in the 3-axle bogie of electrical locomotives of VL60 family by NEVZ that have inter-axle equalizer bars and combination of helical and leaf springs in the second level of primary suspension. Unfortunately it remained low-production (only 80 for 1978-1992) and after USSR breakage Ukrainian plant VZOR (renamed to Luhansk Locomotive Works) continued to develop the series 2TE116, which in the last, the UD model received 4000 hp diesel engine of American manufacture.
2TE121 mainly operated on the Northern Railway of Russia and Donetsk Railway of Ukraine. After the collapse of the USSR, repair of diesel locomotives available in Russia was difficult, and they were not needed in Ukraine, where they were massively decommissioned by 1994-95. In Russia some of them continued to operate on the Oktyabrskaya railroad until 2010, the last one was decommissioned in 2014.
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