The signal 27 N6 at Düren seen on 9 October 2005. It is a Ks signal, but of a special small type to fit under the platform roof. The white-red-white "post plate" says that it is a main signal, and the yellow triangle tells that it is also working as a distant signal. The left box forms the "signal panel", containing a red light (for Hp0 "Stop"), a green light (for Ks1 "Proceed"), a yellow light (for Ks2 "Proceed, expect stop") and two small white lights for the shunting signal Sh1 (one of them is also used to form the substitution signal Zs1). Note the interesting pattern of the red light. For security reasons each of the three big lights is equipped with two light bulbs. If the first one fails, the second one is switched on (and the signalman is informed). The fiber optics coming from the two light bulbs are arranged in this pattern so that the signal aspect looks the same, no matter whether the first or the second light bulb is active. The right box is a Zs3 (speed indicator) which can show a "6" for a speed limit of 60 km/h.

Digital photo by Christoph Schmitz (christoph.schmitz2@post.rwth-aachen.de)