Not long after this adventure the permanent way reached the boundary of the Kapiti Plains, where a station had to be built and where accordingly we took up our headquarters for a week or two. A few days after we had settled down in our new camp, a great caravan of some four thousand men arrived from the interior with luggage and loads of food for a Sikh regiment which was on its way down to the coast, after having been engaged in suppressing the mutiny of the Sudanese in Uganda. The majority of these porters were Basoga, but there were also fair numbers of Baganda (i.e. people of Uganda) and of the natives of Unyoro, and various other tribes. Of course none of these wild men of Central Africa had either seen or heard of a railway in all their lives, and they consequently displayed the liveliest curiosity in regard to it, crowding round one of the engines which happened to be standing at the station, and hazarding the wildest guesses as to its origin and use in a babel of curious native languages. I thought I would provide a little entertainment for them, so I stepped on to the footplate and blew off the steam, at the same time sounding the whistle. The effect was simply magical. The whole crowd first threw themselves flat on the ground howling with fear, and then--with heads well down and arms well spread out--they fled wildly in all directions; nor did the stampede cease until I shut off steam and stopped the whistle. Then, their curiosity gradually overpowering them, very cautiously they began to return, approaching the locomotive stealthily as though it were some living monster of the jungle. Eventually, two of their chiefs summoned up courage enough to climb on to the engine, and afterwards thoroughly enjoyed a short run which I had to make down the line in order to bring up some construction material. Just after this caravan had moved on we were subjected to some torrential rain-storms, which transformed the whole plain into a quaking bog and stopped all railway work for the time being. Indeed, the effect of a heavy downpour of rain in this sun-baked district is extraordinary. The ground, which is of a black sub-soil, becomes a mass of thick mud in no time, and on attempting to do any walking one slides and slips about in the slush in a most uncomfortable manner. Innocent-looking dongas, where half an hour previously not one drop of water was to be seen, become roaring torrents from bank to bank in an incredibly short time; while for many hours or even a few days the rivers become absolutely impassable in this land of no bridges. On this account it is the custom of the wise traveller in these parts always to cross a river before camping, for otherwise a flood may come down and detain him and his caravan on the wrong side of the stream for perhaps a week. Of course when the rain ceases, the floods as quickly subside, the rivers and dongas dry up, and the country once more resumes its normal sun-cracked appearance.