One of the feats of the train is an electric button in each compartment. Commonly an electric button is placed high on the side of the carriage as an alarm signal, and it is unlawful to push it unless one is in serious need of assistance from the guard. But these bells also rang in the dining-car, and were supposed to open negotiations for tea or whatever. A new function has been projected on an ancient custom. No genius has yet appeared to separate these two meanings. Each bell rings an alarm and a bid for tea or whatever. It is perfect in theory then that, if one rings for tea, the guard comes to interrupt the murder, and that if one is being murdered, the attendant appears with tea. At any rate, the guard was forever being called from his reports and his comfortable seat in the forward end of the luggage-van by thrilling alarms. He often prowled the length of the train with hardihood and determination, merely to meet a request for a sandwich. The train entered Carlisle at the beginning of twilight. This is the border town, and an engine of the Caledonian Railway, manned by two men of broad speech, came to take the place of the tandem. The engine of these men of the North was much smaller than the others, but her cab was much larger, and would be a fair shelter on a stormy night. They had also built seats with hooks by which they hang them to the rail, and thus are still enabled to see through the round windows without dislocating their necks. All the human parts of the cab were covered with oilcloth. The wind that swirled from the dim twilight horizon made the warm glow from the furnace to be a grateful thing. As the train shot out of Carlisle, a glance backward could learn of the faint, yellow blocks of light from the carriages marked on the dimmed ground. The signals were now lamps, and shone palely against the sky. The express was entering night as if night were Scotland. There was a long toil to the summit of the hills, and then began the booming ride down the slope. There were many curves. Sometimes could be seen two or three signal lights at one time, twisting off in some new direction. Minus the lights and some yards of glistening rails, Scotland was only a blend of black and weird shapes. Forests which one could hardly imagine as weltering in the dewy placidity of evening sank to the rear as if the gods had bade them. The dark loom of a house quickly dissolved before the eyes. A station with its lamps became a broad yellow band that, to a deficient sense, was only a few yards in length. Below, in a deep valley, a silver glare on the waters of a river made equal time with the train. Signals appeared, grew, and vanished. In the wind and the mystery of the night, it was like sailing in an enchanted gloom. The vague profiles of hills ran like snakes across the somber sky. A strange shape boldly and formidably confronted the train, and then melted to a long dash of track as clean as sword-blades.