I have one like that and I also love the train! Oops! Thought I was in the "New Acquisitions" thread.
On a flat map, it certainly appears that we can get to Angola from Liberia. 1971 twenty-escudos - Portuguese colony (KM 80).
Slim options for me here. I really need to expand my collection of the coins from African states. Let's try Tanzania. A 1990 50-senti (KM 26).