Some signal boxes are equipped with a SpDrS 59 interlock system, instead of SpDrS 60(eg Wuppertal-Vohwinkel). There are some differences between these two interlocking types. On the panel this can be identified by the following elements:
- main signals : the main signals of a Sp Dr S59 system do not have a square Route Locked indicator and Overlap route indicator
- route indicators : in the station tracks three indicators show the state of the routes being set
Main signals of a Sp Dr S59 system do not have a square Route Locked indicator and Overlap route indicator. An example panel tile of a main signal of a Sp Dr S59 system is shown below.
The main difference, compared to Sp Dr S60, is that the round indicator near the signal will be lit if route setting starting at the signal is not possible. This can happen when for example a switch behind the signal has been locked into a position that does not meet the required position to set the route starting at this signal.
Again, do not confuse this round indicator with the 'regluar' Overlap route indicator as we know it from the Sp Dr S60 systems Another difference compared to Sp Dr S60 is, that Sp Dr S59 does not automatically release the overlap route when the train is occupying the track section in front of the signal for a certain amount of time. Revoking the Overlap route always has to be done manually, either by applying DRGT + FRT + Signal button or FHT + Signal button, depending on the situation
On each station track of Wuppertal-Vohwinkel we have three indicators which show the state of the routes being set. They look like the example below:
The meaning of the three indicators depends on how a route has been set, so either from left to right, or from right to left.
- [A] = Entry route properly set and locked
- [B] = Overlap route (D-Weg) set and locked
- [C] = Exit route properly set and locked
The following examples, all for routes from left to right, show the various states that can be shown:
The system indicates that an exit route has been set, and that it has been properly set and locked. The exit signal will show the Proceed aspect in this situation.
The system indicates that both an entry route and an exit route have been set, and that those have been properly set and locked. The overlap route indicator is not lit, which could mean that the start signal of the entry route will not change to Proceed.
The system indicates that both an entry route, an overlap route and an exit route have been set, and that all have been properly set and locked. Both the entry signal as well as the exit signal will show a Proceed aspect.
The system indicates that both an entry route and an overlap route have been set, and that all have been properly set and locked.
The system indicates that only an entry route has been set, and that it has been properly set and locked. As an overlap route is not properly set for some reason, the indicator in the middle will not be lit, and the entry signal will stay at Stop.