LOCOMOTIVE ENGINE AND RAILWAY GRADIENTS. 



171 



TABLE XI. 



PASSENGEH TRAINS. 



The anomalous condition of the performance of the single 

 and double engines presents a, difficulty not easily accounted 

 for. From the 22nd of February to the 6th of March in- 

 clusive, the single engine conveyed to the top of the incline 

 twelve trains, with a mean load of 20*8 tons, at 23 miles 

 an hour, and the greatest weight carried on the 28th 

 February, was 40 tons at the rate of 17*14 miles per hour, 

 a higher rate than in any of the former experiments 

 by the single engine. With the same engine, and an 

 assistant of equal power, the greatest load raised is only 



