44 Book of Locomotives 



length stroke. Writing upon locomotives it 

 will be well to have a cylinder as well as a 

 wheel formula, therefore, I shall use 16x16, 

 which means that the cylinders were 

 1 6 inches in diameter with a stroke of 16 

 inches. 



The " North Star " had a sister, " Morning 

 Star ", but, owing probably to her smaller 

 driving wheels (6| feet), she was not con- 

 sidered nearly such a good engine. It will 

 be found that for good work with uncoupled 

 wheels the best results have almost always 

 been obtained with wheels between 7 and 

 8 feet diameter. 



The " Jenny Linds >: were the natural 

 reply of the narrow gauge to the stalwarts 

 of the broad. These were very numerous 

 as a class, and were found on different rail- 

 ways, mainly because they were the product 

 of private builders. A typical engine of the 

 class had the wheel formula 2-2-2 with 

 cylinders (inside) 15x24, and in the late 

 'forties many of the best expresses on the 

 Midland and London, Brighton and South 

 Coast railways were hauled by this class. 



