CHAPTER IV

THE STEAM LOCOMOTIVE

The earliest railroad, p. 119--The substitution of flanged wheels for flanged rails, p. 120--The locomotive of Richard Trevithick, p. 121--The cable road of Chapman, p. 123--Stephenson solves the problem, p. 124--Versatility of Stephenson, p. 125--His early locomotives, p. 126--Stephenson's locomotive of 1825, p. 127--The first passenger coach, p. 128--The Liverpool and Manchester Railway projected, p. 129--Conditions named for testing the competing locomotives, p. 130--The _Rocket_ and other contestants, p. 132--Description of the _Rocket_, p. 133--Improvements on the construction of the _Rocket_, p. 134--Improvements in locomotives in recent years, p. 135--The compound locomotive, p. 137--Advantages of compound locomotives, p. 138--The Westinghouse air brake, p. 141--The "straight air brake," p. 143--The automatic air brake, p. 144--The high-speed air brake, p. 146--Automatic couplings, p. 147--Principle of the Janney coupling, p. 149--A comparison--the old and the new, p. 150.