Summary

Portrait of Melville Davisson Post Melville Davisson Post Walker of the Secret Service — II. The Holdup (1924)

What human creatures could thus whisper in the sky?
Mooney and White returned presently in no very pleasant mood. I think the time taken with the thing made them uneasy. White had the loot sack and we started along across the field, to where we had left the automobile on the road.
It was then that I got the explanation of the mysterious voices.
There were three hobos riding on the top of the mail car. They had been witnesses of everything that had occurred. They sat there like immense buzzards outlined against the dim light of the sky. Mooney stopped a moment.
Source: Wikisource

Portrait of Melville Davisson Post Melville Davisson Post Walker of the Secret Service — II. The Holdup (1924)

No thought of resistance had occurred to anybody. Mooney sent the trainmen to the rear. He impressed upon them that any man appearing outside of the train would be killed.
In the whirl of these events I seemed to be little more than a spectator.
To the train crew I was the third menacing figure, masked and armed, but I am not certain what benefit I would have been to the two men in a sudden emergency. It was my direction to stay with White and I now ran with him to the engine. Mooney took charge of the end of the train where White had cut it off. He stood on the platform of the mail car.
Source: Wikisource

Portrait of Melville Davisson Post Melville Davisson Post Walker of the Secret Service — II. The Holdup (1924)

A macadamized road paralleled the railroad track and they decided to commandeer a motor car, follow the track to some isolated point, and there stop the train.
This road had what is known as the block system of signals; that is to say, every mile along the track there was a semaphore which informed the engineer whether or not there was another train in the same block or on the same track.
In the day this signaling is done by painted arms and at night by red, green, and white lights: the red light meaning to come to a full stop until the white light is shown
Source: Wikisource

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