. French railways . EST ENGINE 3152. part of the way gives a good idea of the resistanceof the train, which must under these circum-stances have been a little more than 18 lb. a steam on the resistance no doubt increasesa little, so the generally accepted figure of about22 lb. a ton at 75 miles an hour must be aboutright. FRENCH RAILWAYS 107 One kilometre at the bottom of the descentwas run in 29,-, seconds (76-i miles an hour), theregulator here being well open. This was thehighest speed which we EST ENOIXE 3152 (another VIEW). Along the undulations to Boulogne and thefairl
. French railways . EST ENGINE 3152. part of the way gives a good idea of the resistanceof the train, which must under these circum-stances have been a little more than 18 lb. a steam on the resistance no doubt increasesa little, so the generally accepted figure of about22 lb. a ton at 75 miles an hour must be aboutright. FRENCH RAILWAYS 107 One kilometre at the bottom of the descentwas run in 29,-, seconds (76-i miles an hour), theregulator here being well open. This was thehighest speed which we EST ENOIXE 3152 (another VIEW). Along the undulations to Boulogne and thefairly level stretch which follows, we ran most ofthe way in the region of 70 miles an hour, 18kilometres from post 265, taking 10 minutes, and 108 FRENCH RAILWAYS up the succeeding ascent of 4 miles at 1 in 140,the last kilometre wholly uphill (240-239) took40* (not quite 55 miles an hour). Downhill toStaples the speed soon rose to very near the limit,but for some reason sank slightly below 70 milesan hour for a mile or two just past that , however, when we were well on to the levelwe began to run really hard. The regulator waswide open and steam cut off at 58 and 68 per reached 70 miles an hour at about post 223,and from this point the next 45 kilometreswere run at 72 miles an hour. The line is practi-cally level the whole way, generally dead speed varied very little, but for 10 kilo-metres from post 198 was slightly higher than theaverage. The times for this piece were (fromCalais
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