In Australia, a quick scan of currently open stations in various states shows there's only one 3-letter station - Moe, in regional Victoria, south-east of Melbourne.
I could also imagine some soviet nations having numbered rather than named stations, though would probably be of the format ‘Station No.4’.
A lot of stations in remote areas are simply 123Km or suchlike based upon their distance along the line
Australia also used to have some stops of the '110 Mile Crossing' or 'Stopping Place No. X' format.
AFAIK these were
generally wayside halts in remote areas with hardly any facilities apart from a nameboard. But one exception was
'Stopping Place Number 15' on the DMU-worked Stony Point line on Melbourne's outer fringe.
This shack has been renamed
Morradoo since 1996 but had been opened as "Stopping Place No. 15" as late as 1960. I remember the former numbered name appearing and looking quite incongruous printed on the modern, multicoloured diagrammatic maps published by Melbourne's suburban train network in the late 1980s/90s.
On the other hand, some very remote Australian railway locations absolutely in the middle of nowhere on the Nullabor, or the Ghan Line - which could quite conceivably be named '1105 km Siding' etc. - are all given names. Possibly this is to avoid misunderstandings in radio messages. Either an aboriginal name presumably related to the locality, or a person's name. A good handful of these are the surnames of previous Australian Prime Ministers.