CHAPTER XXIX
GUESSING
Young Slavin was marking some initials on the current date on a big calendar hanging up on the door of the coat closet of the depot switch tower.
It was his third day of service. As old Jack Knight came up the trap ladder, his grim face broke into an expression of sincere approbation. He took a keen look around the place.
"Neat and tidy," he observed. "You'll do, Slavin. But what's those hieroglyphics on that calendar for?"
"Oh, just a memoranda," explained the new tower hand, with a conscious flush.
"'P. I. N.' eh?" said Knight.
The initials were blue-penciled in the date space of each of the three days of Slavin's employment.
"Yes, sir."
"What's the answer? Something about a coupling pin?"
"Naw. Those initials, Mr. Knight, represent
