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12-track yard 12N ION Automatic Switching car arrives CAR ENTERS TRACK Code relay code thus originated CONTROL 1 TRACK CONTROL FOR SWITCH control panel designate the track desk diagram ENTERS TRACK CIRCUIT Figure 11 hump and trimmer Hump control machine HUMP UNIT Illinois Central lap switches large yard Lever Position Lever light indicators location B-C machine at Markham machine at Unit Maintainer's Test Panel Markham Yard Southbound Michigan Avenue Chicago Model 6 switch Montreal mounted on racks off-the-track position OFFICE 230 Park position for Automatic pushbutton control machine pushbutton is pressed pushing the button relay units Relays are Type retarder control machine reverse position Rochester route description ROUTE INDICATION LIGHT route light scale retarder shown in Figure single switches stored switch location switch machine SWITCH OPERATES switch points SWITCHES AT LOCATION SWITCHING for Car system of Automatic tower control machine TRACK LEADING TRACK PUSHBUTTONS trimmer signals UNIT A SWITCH