ČSD Class T478.3

In the 1960s, the number of powerful diesel locomotives for mainline service in the former Czechoslovakia was still insufficient.

The new type of locomotive was to be equipped with a V12 diesel engine of a newly developed class with 230 mm bore.

The new engine was able to run at higher RPM and thus develop more power at the output of the traction generator at high locomotive speeds than the older designs.

The situation was so bad that some of the already withdrawn steam locomotives had to be put back into service.

The steam heating has not been used since the end of the 1990s and the remaining locomotives of the original class continued to be used in freight transport.

Since the 1990s, the 753 class has been gradually withdrawn both in the Czech Republic and Slovakia and either reconstructed, stored for future use or scrapped.

Since 1991, 163 locomotives of the original class have been equipped with 3000 V electric train heating generator to satisfy the growing need for head-end power for new passenger cars.

As of April 2020, some units of this class are still in use in freight transport by ČD Cargo and some private operators.

The locomotive received an entirely new composite body, a Pielstick 12 PA 4 - 185 engine set to 1470 kW, a traction alternator and rectifier and a new control system.

[2] The locomotive has never been put into a fully operational order and after few trials, the whole project has been cancelled.

Since 2001 until 2011, 106 locomotives of both the original 753 and 750 classes have been extensively rebuilt using a new Caterpillar 3512 B DI-TA engine and a new electronic control system.

Since 2010, reconstructions similar to the 753.7 class, but equipped with an electric train heating generator, have been done in the Czech Republic and Slovakia.

In Ostrava ,1986
The steam-heating era
753.301
755 ŽSR
Private 752 in the Czechia
Class D 753 in Italy
753.6 SD