Eighty five class 121 electrics were built in 1960 as a lower geared freight version of class 141. While class 141 were relatively easy to find on station pilot and a few local passenger workings around Praha in 2006, the 121s had no booked work and only made rare outings from their Usti nad Labem base.
The appearance of 121.019 on an eastbound coal train at Bezpravi on the morning of 10 June 2006 was totally unexpected and a very pleasant surprise.