The physician rose from his seat. “Dr. Tupelo,” he began, timorously, “when the train does reappear, will the passengers—?”
“I don’t know about the people on the train,” Tupelo cut in. “The topological theory does not consider such matters.” He looked quickly at each of the seven tired, querulous faces before him. “I am sorry, gentlemen,” he added, somewhat more gently. “I simply do not know.” To Whyte, he added: “I think I can be of no more help tonight. You know where to reach me.” And, turning on his heel, he left the car and climbed the stairs. He found dawn spilling over the street, dissolving the shadows of night.
That impromptu conference in a lonely subway car was never reported in the papers. Nor were the full results of the night-long vigil over the dark and twisted tunnels. During the week that followed, Tupelo participated in four more formal conferences with Kelvin Whyte and certain city officials. At two of these, other topologists were present. Ornstein was imported to Boston from Philadelphia, Kashta from Chicago, and Michaelis from Los Angeles. The mathematicians were unable to reach a consensus. None of the three would fully endorse Tupelo’s conclusions, although Kashta indicated that there might be something to them. Ornstein averred that a finite network could not possess infinite connectivity, although he could not prove this proposition and could not actually calculate the connectivity of the System. Michaelis expressed his opinion that the affair was a hoax and had nothing whatever to do with the topology of the System. He insisted that if the train could not be found on the System then the System must be open, or at least must once have been open.
But the more deeply Tupelo analyzed the problem, the more fully he was convinced of the essential correctness of his first analysis. From the point of view of topology, the System soon suggested whole families of multiple-valued networks, each with an infinite number of infinite discontinuities. But a definitive discussion of these new spatio-hyperspatial networks somehow eluded him. He gave the subject his full attention for only a week. Then his other duties compelled him to lay the analysis aside. He resolved to go back to the problem later in the spring, after courses were over.
Meanwhile, the System was operated as though nothing untoward had happened. The general manager and the mayor’s representative had somehow managed to forget the night of the search, or at least to reinterpret what they had seen and not seen. The newspapers and the public at large speculated wildly, and they kept continuing pressure on Whyte. A number of suits were filed against the System on behalf of persons who had lost a relative. The State stepped into the affair and prepared its own thorough investigation. Recriminations were sounded in the halls of Congress. A garbled version of Tupelo’s theory eventually found its way into the press. He ignored it, and it was soon forgotten.
The weeks passed, and then a month. The State’s investigation was completed. The newspaper stories moved from the first page to the second; to the twenty-third; and then stopped. The missing persons did not return. In the large, they were no longer missed.
One day in mid-April, Tupelo traveled by subway again, from Charles Street to Harvard. He sat stiffly in the front of the first car, and watched the tracks and gray tunnel walls hurl themselves at the train. Twice the train stopped for a red light, and Tupelo found himself wondering whether the other train was really just ahead, or just beyond space. He half-hoped, out of curiosity, that his exclusion principle was wrong, that the train might make the transition. But he arrived at Harvard on time. Only he among the passengers had found the trip exciting.
The next week he made another trip by subway, and again the next. As experiments, they were unsuccessful, and much less tense than the first ride in mid-April. Tupelo began to doubt his own analysis. Sometime in May, he reverted to the practice of commuting by subway between his Beacon Hill apartment and his office at Harvard. His mind stopped racing down the knotted gray caverns ahead of the train. He read the morning newspaper, or the abstracts in Reviews of Modern Mathematics,
Then there was one morning when he looked up from the newspaper and sensed something. He pushed panic back on its stiff, quivering spring, and looked quickly out the window at his right. The lights of the car showed the black and gray lines of wall-spots streaking by. The tracks ground out their familiar steely dissonance. The train rounded a curve and crossed a junction that he remembered. Swiftly, he recalled boarding the train at Charles, noting the girl on the ice-carnival poster at Kendall, meeting the southbound train going into Central.
He looked at the man sitting beside him, with a lunch pail on his lap. The other seats were filled, and there were a dozen or so straphangers. A mealy-faced youth near the front door smoked a cigarette, in violation of the rules. Two girls behind him across the aisle were discussing a club meeting. In the seat ahead, a young woman was scolding her little son. The man on the aisle, in the seat ahead of that, was reading the paper. The Transit-Ad above him extolled Florida oranges.
He looked again at the man two seats ahead and fought down the terror within. He studied that man. What was it? Brunette, graying hair; a roundish head; wan complexion; rather flat features; a thick neck, with the hairline a little low, a little ragged; a gray, pin-stripe suit. While Tupelo watched, the man waved a fly away from his left ear. He swayed a little with the train. His newspaper was folded vertically down the middle. His newspaper! It was last March’s!
Tupelo’s eyes swiveled to the man beside him. Below his lunch pail was a paper. Today’s. He turned in his seat and looked behind him. A young man held the Transcript open to the sports pages. The date was March 4th. Tupelo’s eyes raced up and down the aisle. There were a dozen passengers carrying papers ten weeks old.
Tupelo lunged out of his seat. The man on the aisle muttered a curse as the mathematician crowded in front of him. He crossed the aisle in a bound and pulled the cord above the windows. The brakes sawed and screeched at the tracks, and the train ground to a stop. The startled passengers eyed Tupelo with hostility.
At the rear of the car, the door flew open and a tall, thin man in a blue uniform burst in. Tupelo spoke first.
“Mr. Dorkin?” he called, vehemently.
The conductor stopped short and groped for words.
“There’s been a serious accident, Dorkin,” Tupelo said, loudly, to carry over the rising swell of protest from the passengers. “Get Gallagher back here right away!”
Dorkin reached up and pulled the cord four times. “What happened?” he asked.
Tupelo ignored the question, and asked one of his own. “Where have you been, Dorkin?”
The conductor’s face was blank. “In the next car, but—”
Tupelo cut him off. He glanced at his watch, then shouted at the passengers. “It’s ten minutes to nine on May 17th!”
The announcement stilled the rising clamor for a moment. The passengers exchanged bewildered glances.
“Look at your newspapers!” Tupelo shouted. “Your newspapers!”
The passengers began to buzz. As they discovered each other’s papers, the voices rose. Tupelo took Dorkin’s arm and led him to the rear of the car, “What time is it?” he asked.
“8:21,” Dorkin said, looking at his watch.
“Open the door,” said Tupelo, motioning ahead. “Let me out. Where’s the phone?”
Dorkin followed Tupelo’s directions. He pointed to a niche in the tunnel wall a hundred yards ahead. Tupelo vaulted to the ground and raced down the narrow lane between the cars and the wall. “Central Traffic!” he barked at the operator. He waited a few seconds, and saw that a train had stopped at the red signal behind his train. Flashlights were advancing down the tunnel. He saw Gallagher’s legs running down the tunnel on the other side of 86. “Get me Whyte!” he commanded, when Central Traffic answered. “Emergency!”