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A preliminary railway signal on the rail near park Hecht
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This is a preliminary railway signal, that designed to mark the mode of the main railway signal.
It is here in 2 orange light mode, meaning that the next railway signal is red (Stop).
It can be one orange and one green, meaning that the next railway signal is orange (Drive at limited speed), and 2 green lights. meaning that the next signal is green (Drive).
This railway signal have incandescent lamps and probably changes by moving orange and green filters.
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