I start with the most important: some wild boar information. If you are lucky, you can get a live wild boar on the side of the road. Wild boars are actually less ferocious than pigs. You can keep them like pigs, domestically. Pigs are extremely mean. Two lions against one pig, and one of the lions will go down. A pig will run up to a tree, with its rear against the trunk, and dig in for defence.
There is a train from Lichinga to Cuamba, the two main cities in Niassa. And then from Cuamba to Napula. But the train from Lichinga to Cuamba (300km) takes three days. For this reason, presumably, it only takes cargo. Once a friend hopped the train in Cuamba to Lichinga. After the first night it had only gone 20km. It stopped in one place for 5 days. He got to Lichinga 17 days later. (The road, in the dry season, takes a couple of hours. In the rainy season it can take between 7 hours and two days.) So, adventurers: take the train from Nampula to Cuamba, by all means. It is supposed to be breath-taking, and ideally takes only 8 hours. Then hop the chapa minibus from Cuamba to Lichinga. (I plan on doing this someday.)
People walking on the roads NEVER walk on the side of the road. They are not scared of cars. Even in “Hound of the Baskervilles” type fog which sometimes envelops the planalto. They just keep on trucking. On the asphalt.