the writer was superintendent, was placed in service on the Boston and Maine Railroad, April 16, 1855, and continued to run regularly double round trips between Boston and Lawrence, distance 26 miles, daily, except Sundays, or on other equivalent routes, until the close of 1883, a period of 28 years 9 months. The record, subsequent to 1876, was destroyed by fire a year ago; but one book escaped, which shows when this engine was in the repair-shop, and the amount. of repairs upon her, from the start, down to Dec. 23, 1873, 18.8 years. The superintendent of repairs on this road, Mr. William Smith, ran the Pacific" thirteen and a half years, making an aggregate mileage, during that time, of 417,879 miles. Mr. Smith is perfectly familiar with her performance since 1873; and from information obtained from him, and from the record, which I have transcribed, it appears that

Her total mileage on passenger-trains, in 28.8 years, was. 891,475 And her subsequent mileage on gravel-trains, to Aug. 1, 1884, is 12,780

She has had one new fire-box, and one new set of flues, and other extensive repairs, and is now in good serviceable order; and more than one-half of the weight of the original material originally put into her is in her to-day. This engine has outside connections, shifting link valve-gear, cylinders 15 inches diameter, 22 inches stroke, 4 connected drivers 66 inches diameter, and a centre-bearing truck. Total weight 27.5 tons, weight on driving-wheels 17 tons. Price, in dear times, $8,500, say £1,756.

The statement summarized below, of the performance of three locomotives on the Hudson River Division of the New York Central and Hudson River Railroad, was kindly furnished to the writer by Mr. William Buchanan, superintendent of motive-power of that division.

The three engines, designated as No. 10, No. 33, and No. 34, are of the following general dimensions: Cylinders, 17 inches diameter, 24 inches stroke; driving-wheels, 69 inches diameter; fireboxes of steel, flues of semi-steel; weight in running order, 31.473 tons (70,500 pounds); weight on driving-wheels, 20.022 tons (44,850 pounds); average trains, 2 baggage and mail cars 52 tons, 2 drawing room or sleeping cars 64 tons, 5 first-class passenger-cars 125 tons, engine 31 tons, tender, half loaded, 22 tons; total, 294 tons. Average speed of trains, 38 miles per hour. Period of time covered, 6 years, from December, 1876, to December, 1882, for No. 10 and No. 33; and from March, 1877, to March, 1883, for No. 34.