4-4" an d 4-6-0 Locomotives 55 

 increase in boiler dimensions. He set to 

 work and produced his exceedingly fine 

 " Dunalastairs ". In all, three series of 

 these blue-coated steeds were placed in 

 service, and gave excellent results. 



It is on record that the pioneer of the 

 type persistently took on trains weighing up 

 to 350 tons on the exceptionally heavy 

 section of the West Coast route to Scotland ; 

 these trains had been double-headed as far 

 as Carlisle by the North- Western. 



On the North-Eastern, very soon after 

 the first batch of " Dunalastairs " were in 

 service on the Caledonian, Mr. Worsdell 

 brought out his famous " R " class of very 

 similar machines. With big boilers, inside 

 cylinders, driving 6 ft. 10 in. coupled 

 wheels, these engines have always been 

 consistently good. 



At the same time the first challenge came 

 to the 4-4-0 in the shape of the " Atlantic ", 

 and soon after the 4-6-0 proved a doughty 

 challenger also. But for the ordinary express 

 work the 4-4-0 was found the ideal type, 

 being the happy medium between the 



