Marker lights on the caboose mark the rear of the train and usually have a (large) red lens and two (smaller) green lenses. Markers could be rotated in their brackets to display green to the rear when a train was in the clear on a siding and the mainline switch was properly lined.
Classification lights are a whole different story. They have two clear lenses - one facing ahead, one to the side. They could not be rotated. Inside was a green glass 'flipper-flapper' that could be moved into position with a short handle on the side of the light. Regular passenger trains and scheduled freight trains would have the class lights dark (off) unless the schedule was being run in sections. Then the class lights would be turned on and display green ('Section or sections following...."). The last train running on that schedule would have dark class lights.
White class lights indicated an "Extra", a freight (or passenger) train that had no schedule in the emloyee operating timetable. Depending on how a particular part of the railroad was operated even freight trains that were known by a number (#76, #99, whatever) would be run as 'extra' trains.
Bob Weber
Classification lights are a whole different story. They have two clear lenses - one facing ahead, one to the side. They could not be rotated. Inside was a green glass 'flipper-flapper' that could be moved into position with a short handle on the side of the light. Regular passenger trains and scheduled freight trains would have the class lights dark (off) unless the schedule was being run in sections. Then the class lights would be turned on and display green ('Section or sections following...."). The last train running on that schedule would have dark class lights.
White class lights indicated an "Extra", a freight (or passenger) train that had no schedule in the emloyee operating timetable. Depending on how a particular part of the railroad was operated even freight trains that were known by a number (#76, #99, whatever) would be run as 'extra' trains.
Bob Weber
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