Enid Blyton 
The Mystery of Tally-ho Cottage [EPUB ebook] 

One afternoon four children and a dog walked into the little railway station at Peterswood. The dog ran about happily, his tail wagging all the time.
‘Better put Buster on the lead, ’ said Pip. ‘We’re early, and two or three trains may come through. Here, Buster—come to heel, old boy!’
The little Scottie trotted up, his tail wagging nineteen to the dozen. He gave a few short barks.
‘Yes, I know you’re longing to see Fatty, ’ said Pip, bending over him to clip on his lead. ‘So are we all! Hey, keep still!’
‘Hang on to him—here comes a train!’ said Larry. ‘It’s going right through.’
Buster stood his ground bravely until the train gave a piercing whistle as it tore through the station—then he tried to scuttle under a wooden seat and dragged Pip after him. He sat down with his back to the train and trembled. That awful whistle!
‘It made me jump!’ said Bets. ‘Cheer up, Buster—Fatty will soon be here. We’ve loved having you while Fatty’s been away, and you’ve been Very Very Good!’
‘Even Mother likes you!’ said Pip, patting him. ‘Though she didn’t a bit want us to keep you while Fatty was in Switzerland!’
‘I can’t think why Fatty had to go off to Switzerland for a whole fortnight, and be away all Christmas time, ’ complained Bets.
‘Well, he had to go with his parents, ’ said Daisy. ‘I expect he had a jolly good time in all that snow.’