Abstract
In this article topological operation tables used to steer and control railway traffic are submitted. Tables contain elements set in typically shaped cubes. The article describes results of experiments connected with measurement of luminance and colour of operation tables with normally used 24V bulbs and with introduced LEDs. The lack of precised directives about colours used for background and signal elements makes that with different configurations of cubes and sources achieved colour is different that predicted. Measurements of illuminating surface at topological operation tables.
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