The T 466.0 was a 1,200 hp diesel locomotive for passenger and freight service in hilly regions on both main and secondary lines. In this role, it was positioned between the 725 hp T 444 and the 1,500 hp T 478.1. The nickname “Pielstick” came about since the Czechoslovak manufacturers could not supply an engine in the desired power range and license-built a French Pielstick engine. Between 1971 and 1979, 299 were built for the ČSD and five for industrial users.

They had a significant share in the replacement of the last steam locomotives. In the beginning they were equipped with steam heating boilers which were later swapped for electric train heating. From 1988 they were designated class 735. However, most were retired in the nineties after around 20 years in service since they consumed too much fuel compared to more modern locomotives and the procurement of spare parts was not easy. Sixty were rebuilt into the two-engine class 714. The last ones were gone in 2002.