G) ankirk and Glasgow Railway. 53 



George Stephenson, the Glasgow, the Garnkirk, and the Gar- 

 gill) presently on the road, besides a new one put on a few 

 weeks ago for a trial. The oldest one is the George Stephen- 

 son, made by Messrs Stephenson, Newcastle. Its weight is 6^ 

 tons, exclusive of the water in the boiler. It has two cylinders 

 11 inches diameter and 16 inches stroke. Boiler 3 feet 3 

 inches diameter, 7 feet long, exclusive of the fire-box, which is 

 surrounded by water. The power of this engine is calculated 

 to be about 30 horse. The ordinary loads drawn by this en- 

 gine is 80 tons, but it has frequently hauled upwards of 110 tons 

 at the rate of 12 miles an hour. This engine, with a train of 

 empty waggons and a carriage with nine passengers, weighing in 

 all about twenty tons, travelled at the rate of one mile in one 

 minute and a quarter, being at the rate of 48 miles an hour. 



The Glasgow engine, nearly similar in construction to the 

 George Stephenson, weighing 8^ tons, its power is calculated at 

 30 horse, and the usual load drawn by the engine is 90 tons ; 

 it has, however, drawn 140 at the rate of 7 J miles an hour. 

 The Garnkirk engine, made by Murdoch and Aiken, Glasgow, 

 weighs 7 tons 16 cwt. Its power is about 30 horse, and it is 

 similar in construction to the last two. The Gargill engine, 

 likewise made by M. and A., weighs 11 tons; its cylinders are 

 13 inches diameter, and its stroke 18 inches. Its power is cal- 

 culated at about 40 horse, and its usual loads is from 30 to 40 

 waggons, weighing 4 tons each ; on one occasion it hauled a 

 train of 70 waggons, weighing in all 287^ tons, a distance of 8 

 miles in one hour and five minutes. 



During last year, this engine performed about three trips per 

 day of 16^ miles, one half loaded and the other half empty wag- 

 gons. Reckoning 310 working days in the year, we have about 

 111,000 tons conveyed by this engine along the whole line, or 

 about 1,370,000 tons conveyed one mile. 



The cylinders of the new engine are 13 inches diameter, and 

 18 inches stroke, and its power is 40 horses. 



All the engines have two safety valves, one only under the 

 control of the engineer. The usual working pressure is from 45 

 to 50 lbs. per square inch. The cylinders of the Gargill engine 

 are placed at an angle of 45 degrees ; the cylinders of the other 

 three are horizontal, and those of the new engine vertical. AH 



