Semi-automatic semaphores have a chamber layout adapted to the planned speeds and movement needs at the station. Home semaphores are usually five-chamber with a light system (from above) green, orange, red, orange, matte white. These semaphores are also used as exit signals, if the trail behind the station is equipped with ABS. Sometimes semaphores of this type are equipped with green, orange or both light stripes. If the course to which the semaphore relates will be driven only straight ahead (e.g. it is not possible to descend to the reverse path) simplified semaphores without orange light chambers (arrangement of lights: green, red, matt white) or without one orange light (green, red, orange, matte white) are used. If there are no maneuvers at the station and there is little traffic on its area, some semaphores don't have a matte-white light chamber. If the station is an end station or trains do not pass through it without stopping, you can use semaphores without a green light chamber (orange, red, orange, white, or orange, red, white).
Logic of information provided by signals is as follows:
- Upper light always shows allowed speed on second part of the route (after next signal), lower light and lightbar on first part of the route (after signal they're on)
- If only one light is lit, it informs the driver about maximum allowed speed on second part of the route, maximum speed on the first part is maximum line speed ( apart from "S1" aspect "Stop", when red light menas sto pbefore the signal)
If displayed aspect is comprised of two lights, then it's allowing the driver to drive past this signal at speed reduced to 100, 60 or 40 km/h which is conveyed by the lower yellow light, sometimes supplemented by a lightbar of green or yellow colour. Upper light informs about the aspect of next signal.
If distant signal is placed next to the signal, then distant signal is displaying what aspect next signal is showing, not the upper light of the signal
| S1
|
Sz - Subsidiary signal
|
|
|
| Stop
|
20 or 40 km/h
|
| S2 |
S3 |
S4 |
S5
|
|
|
|
|
| vmax
|
| vmax
|
100 km/h
|
40 or 60 km/h
|
Stop
|
|
| S6 |
S7 |
S8 |
S9
|
|
|
|
|
| 100 km/h
|
| vmax
|
100 km/h
|
40 or 60 km/h
|
Stop
|
|
| S10 |
S11 |
S12 |
S13
|
|
|
|
|
| 40 km/h
|
| vmax
|
100 km/h
|
40 or 60 km/h
|
Stop
|
|
| S10a |
S11a |
S12a |
S13a
|
|
|
|
|
| 60 km/h
|
| vmax
|
100 km/h
|
40 or 60 km/h
|
Stop
|
|
Bibliography
