The kkStB 73 were a class of 0-8-0 steam locomotives of operated by the Imperial Royal Austrian State Railways (kaiserlich-königliche österreichische Staatsbahnen, k.k.St.B.

After it had been displaced from freight traffic by more powerful locomotives (classes 170, 270, 180, 80), it was reused for shunting service.

The ČSD withdrew the last machine of the 414.0 series from their inventory in 1969 and handed it over to the National Technical Museum in Prague.

The ČSD locomotive 414.096, the last example of this series in use in the Czech Republic, which was nicknamed "Heligon", has been subjected to a general inspection in the Lužná u Rakovníka Railway Museum since 2009.

The last Yugoslav machine, the former kkStB 73.372, is in the Slovenian Railway Museum in Ljubljana together with a tender for oil firing.