VIADUCT, NEAR WATFORD, LONDON AND NORTH-WESTERN RAIL-ROAD. 



THE LOCOMOTIVE. 



CHAPTER II. 



23. Speed. 24. Locomotive stock. 25. What record of the performance 

 and condition of an engine should be kept. 26. Cause of renewals of 

 English locomotives. 27. Average mileage of engines. 28. Locomo- 

 tive requires rest. 29. Expense of cleaning and lighting. 30. Keserve 

 engines. 31. Bank engines. 32. Time they are kept standing. 

 33. Economy of fuel. 34. Register of consumption. 35. Small 

 amount of useful service obtained. 36. On Belgian lines. 37. On 

 other Continental lines. 38. On London and North Western line. 

 39. Comparisons between lines not fairly instituted. 40. Legitimate 

 test of comparison. 41. Amount of locomotive stock required. 42. 

 Gross receipts of European Railways in 1850. 43. Mileage of the 

 same. 44. Great increase since. 45. Enormous .consumption of 

 coal. 46. Mileage of passengers and goods. 



23. WHEN the extraordinary speed sometimes imparted to the 

 loads drawn hy locomotive engines on the English railways is 

 considered, it will not be uninteresting to explain what operations 



LARDNER'S MUSEUM OF SCIENCE. K 129 



No, 72. 



