what does the word locomotive mean

When tractors were first developed, they used enormous steam engines that were notoriously unreliable and hard to maintain. These were phased out around the turn with the twentieth century and substituted for internal combustion engines which were smaller though powerful and ran on a number of fuels including kerosene, ethanol and gasoline. By the 1960s several of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel. Of these, you can also use the Windows Classic theme to set the Start menu and taskbar back to a good old Windows XP default look, should you get bored of all the pretty pictures and artistic touches. Also, remember that Windows 7 Starter and Home Basic will not come with these features. Not that this should be a problem for 99.9% of all users.