The sky ride has been closed since the park reopened.
For the train, when I was there last week they were only running 1 train and loading every other row. It is only a 1 way trip and it may not be possible to get back in line at the other station and get right back on because of the lower capacity. If you don't care about the round trip, the ride from Narobi to Stanleyville is longer than Stanleyville to Narobi (Congo station is closed).
Sheikra had the longest wait in the park. They were only using 1 station and there was 1 person assigning rows and checking Quick Queue which caused the coaster to be in the station waiting for riders before they finished scanning everyone's Quick Queue.