SPRINGFIELD, ILLINOIS Lincoln's Home. State Capitol And, rail crossroads of central Illinois. In 1991, three manned interlockers still operate. Visit these, plus nearby locations for runbys of all current rail operators. Then, we take you back to the days of traction on the Illinois Terminal, pacing fast blue cars and observing freight motors And the sharp green and yellow diesels of several varieties Next the C&IM is viewed SD9s and 18s double Petersburg Hill with coal. And the RS1325s in action. Then, the trunk lines - Illinois Central Gulf, Mobile & Ohio, Wabash - vintage footage plus more current scenes of Amtrak CM& W, Gateway Western and N-S