He thrust himself close against David.
"Who the devil are you ?" demanded the man from the tug.

"How'd you get here ?" "I walked," said David.
"Walked ?" the man snorted incredulously.
"I took the wrong train," explained David pleasantly.

"They put me off about a mile below here.

I walked back to this flag station.

I'm going to wait here for the next train north." The little man laughed mockingly.
"Oh, no you're not," he said.