T478.3 is a class of locomotives built for Czechoslovak State Railways to replace the most powerful steam locomotives (such as 477.0, 475.1 or 498.1)...

T478.4 is a class of diesel locomotives designed, manufactured and used in the former Czechoslovakia and now used in the Czech republic (ČD Class 754)...

axles, max. speed 120 km/h or greater, 18 tonnes per live or coupled axle T478 ... diesel locomotive, 4 live or coupled axles, max. speed 100 km/h, 18 tonnes...