To continue the Yugoslav examples I showed on a previous page: here we move on to post-WW2.
The final pre-war double-circle type continued to be used under the Republic:

Visegrad-Sarajevo Line 18 1956
But the vast majority post-war were a single circle cancel which exists in a number of sub types. The first types have the two terminal offices of the line at the top of the circle, and the line number at the bottom :

Large numeral
Vis-Beograd Line 2 1964

Small numeral
Rijeka-Zagreb Line 23 1956

As above but in Cyrillic script
Subotica-Beograd Line 7 1948
The following types have an intermediate as well as the two terminal offices:

Large numeral
Subotica-Senta-Novi Sad Line 156 1964

Small numeral
Novi Sad-Beograd-Vrsac Line 174 1956
A different type has no Line number, replaced with an asterisk:

Ljubljana-Sentvid 1967
Finally a 'one off' type:
In the bottom of the circle is the Line number and the terminal offices. At the top (though difficult to read on this copy) is the word Omladinska. This means Youth (short for omladinska pruga = youth railway). This was to commemorate the fact that this railway was built by volunteers from Youth organizations.

Samac-Sarajevo Line 37 1947