The same observance of the principles of economy is maintained with regard to their locomotive stock. The engines are strongly built, safe and powerful, but are destitute of much of that elegance of exterior and beauty of workmanship which has excited so much admiration, in the machines exhibited in the Crystal Palace. The fuel is generally wood, but on certain lines near the coal districts coal is used. The use of coke is nowhere resorted to. Its expense would make it inadmissible, and in a country so thinly inhabited the smoke proceeding from coal is not objected to. The ordinary speed, stoppages included, is from 14 to 16 miles an hour. Independently of other considerations, the light structure of many of the roads would not allow a greater velocity without danger; nevertheless we have frequently travelled on some of the better constructed lines at the ordinary speed of the English railways, say 30 miles an hour and upwards. Notwithstanding the apparently feeble and unsubstantial structure of many of the lines, accidents to passenger trains are scarcely ever heard of. It appears by returns now before us that of 9,355,474 passengers booked in 1850 on the crowded railways of Massachusetts, each passenger making an average trip of 18 miles, there were only 15 who sustained accidents fatal to life or limb. It follows from this, by the common principles explained by us in a former article, that when a passenger travels one mile on these railways the chances against an accident producing personal injury, even of the slightest kind, are 11,226,568 to 1, and of course in a journey of 100 miles the chances against such accident are 112,266 to 1. We have shown in a former article that the chances against accident on an English railway, under like circumstances, are 85,125 to 1. The American railways are, therefore, safer than the English in the ratio of 112 to 85.