the railway station.
IV
Arrived at the station, Arnold sought Mr. Cutbush in his office, to which, at his request, the booking clerk was summoned. The latter remembered perfectly selling Sir Wilfred a ticket on the previous morning. It had been a first-class day return to London. The return half of this ticket had not been handed in.
Having secured this information, Arnold took the next train, which happened to be a fast one, to Blackdown. During the journey, he pondered the question of the missing ticket. It was a trifling circumstance, as Marden had remarked. Anything might have happened. It might have fallen out of Sir Wilfredâs pocket while his body was being carried from the compartment to the waiting-room, for instance. But supposing it hadnât? Suppose it had passed from Sir Wilfredâs possession between the times of his passing the barrier at Cannon Street and his arrival at Stourford. What then?
Arnold repeated the question to himself without finding any plausible answer. It was ridiculous to suggest that it had been stolen from Sir Wilfred, either before or after his death. Who would steal a railway ticket, and leave behind valuables and a sum of money? Besides, how could anybody have obtained access to the locked compartment? Easily enough, if they had a railway key. But could they have done so without attracting notice? It seemed highly improbable. Arnold decided that it would be necessary to interrogate the other twenty-four passengers who had travelled in the first-class coach.
His train arrived at the entrance to Blackdown Tunnel as he reached this decision. Before it had travelled many yards farther, the windows of his compartment were rendered opaque by a mixture of smoke and steam deposited on the outside. And the roar was certainly loud enough to drown the report of a small pistol. Arnold noted these things. He also timed the passage of the train through the tunnel. It took three minutes and twenty-five seconds. Allowing for the slowing up and acceleration, the train in which Sir Wilfred had been travelling must have taken at least five minutes. And a lot can happen in five minutes, as Arnold knew well enough.
Shortly after emerging from the tunnel, the train pulled up at Blackdown station. Arnold got out, and sought the station-master, to whom he introduced himself. He explained that he was investigating the death of Sir Wilfred Saxonby, who had been found dead the previous day on the arrival at Stourford of the five oâclock train from Cannon Street. âAnd thereâs some reason to believe that he died in Blackdown Tunnel,â he added.
âIn the tunnel, eh?â the station-master replied. âThatâs not the only queer thing that happened in the tunnel yesterday evening. The driver of that very train reported that he was held up in the tunnel by a man waving a red light. He must have dreamt it, for there was certainly nobody there.â
âCan you be sure of that?â Arnold asked.
âAs sure as that Iâm talking to you now. Iâll explain why. To begin with, the tunnel isnât exactly the place one would choose for an evening stroll. The public donât use it as a promenade, so to speak. The only people who ever go into it on foot are the permanent way men. And, during the whole of yesterday, none of these men set foot inside it. Besides, they donât go in singly. They go in a gang, and light flares. The driver reports no flares, only a red light which changed to green just before he reached it.
âNow, I know what youâre going to say. If it wasnât one of the permanent way men, it must have been some unauthorised person who had somehow wandered in. Well, I say it couldnât have been, and for this reason. At each end of the tunnel there is a signal cabin, and nobody could possibly get in without being seen by the men on duty. Even after dark a strong light shines from the windows of the cabins on to the line.