MAPPING THE PASTMAP 20.2 Continental Industrialization, ca. 1850 Although continental countries were beginning to make progress by 1850, they still lagged far behind Great Britain. For example, continental railroad building was still in an early stage, whereas the British rail system was essentially complete (see Map 20.1). Coal played a critical role in nineteenth-century industrialization both as a power source for steam engines and as a raw material for making iron and steel.ANALYZING THE MAP Locate the major exposed (that is, known) coal deposits in 1850. Which countries and areas appear rich in coal resources, and which appear poor? Is there a difference between northern and southern Europe?CONNECTIONS What is the relationship between known coal deposits and emerging industrial areas in continental Europe? In Great Britain (see Map 20.1) ?