The first thing that came over the edge of the wall of luggage was the cap of a flying man, then two broken horns, then a mild hairy sort of face, the mouth of which went round and round. ‘Oh, are you the cow and the other pilot?’ asked David. ‘Hush,’ said the cow. ‘I’m incognito, disguised as a porter, and collecting evidence.’ ‘What about?’ asked David. ‘Anything, as long as it’s evidence. Don’t give me away, and I’ll help you. Is this all you’ve got? That’s nothing to what people travel with now.’ ‘Yes, that’s all,’ said David. ‘At least I suppose that’s all.’ ‘You mayn’t have less than a hundred pieces, and they must all weigh a hundred pounds each,’ said the cow, referring to a blue paper of regulation which she carried. ‘But I won’t take no notice if you’re a bit under weight.’ The cow had climbed up a little higher, and David could see she had a dark blue coat, with a red tie like the people at Waterloo. ‘Perhaps I’d better get you out first,’ said the cow. ‘You seem sort of hemmed in. If you’ll stop just where you are, I’ll butt my way somewhere. Steady now, stop just where you are.’ David clung to the portmanteau which was on the top of the pile, and heard the cow retreat a few steps, and breathe heavily. ‘Now, I’m coming,’ she said, and next moment she charged through a weak part of the wall, which consisted only of lighter articles like dressing-cases and gun-cases and bags of golf-clubs. A lunch-basket had stuck on her horns, and she shook her head till it fell off with a great clatter of tin-plates and knives and forks. ‘That was a good bit of evidence,’ she said panting. ‘What train are you going by?’ ‘The 11.29 I think,’ said David. The cow looked at the labels. ‘That’s all right then,’ she said. ‘That’s the one that goes Anywhere. It’s whistling loud still, so you’ve got heaps of time. There’s more time than luggage.’ ‘But doesn’t its whistling mean that it’s just going off?’ asked David. He had a firm idea in his mind that he _must_ catch the 11.29, or the whole plan would go wrong. ‘Not a bit of it, dearie,’ said the cow. ‘It whistles loudest when it’s going to stop longest, and whistles faintest when it’s going to stop shortest. Now if it was whistling soft, we should have to hurry. The moment it stops whistling altogether, then it’s off, and you have to wait for the next. Usually there isn’t a next, and then the trouble begins.’ ‘Then do they whistle all the time they stand still?’ asked David. ‘Naturally. When they go, there’s something else to think about.’ She looked at him with a mild milky sort of eye. She was dressed in a large jacket, and a pair of trousers which covered her completely all but her face and her tail. ‘And to think that I ever thought of tossing you,’ she said. ‘Well, bye-gones are gone-byes, and now I feel like a mother to you. Let’s get going with your bits of luggage, or the train you’re going to get will get gone.’