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ZNP801 with an example set of commands shown.

The ZNP801 is a system used to alleviate much of the vocal communication between dispatchers in neighbouring signal boxes. Offering, accepting, refusing, and cancelling of trains are supported by this system. Additionally, train numbers can be changed on the panel.


The system works by collecting a series of values and commands. When the sequence has been entered, the dispatcher sends the commands to a neighbour. The neighbour, using his ZNP801, makes a decision about how to handle the request.

Offering Trains

To offer a train, you need to enter the train number, followed by the station to which you're sending the train, followed by the track number, and completed with the "ANB" command. "ANB" indicates that this is an offering. For example, sending train "3435" with steering number "1" to neighbour "XYZ" on track "123", you would enter:

13435 XYZ 123 ANB

To actually send the command, press "ZNS". The train number will begin to blink on the panel. What this means is that the command has been sent to the neighbour, and you are waiting for his acceptance or refusal. If he refuses, the number stops blinking and disappears. If he accepts, the number stops blinking and becomes solid. The neighbour might take a minute or two to accept or refuse, so be patient

Cancelling an offered train

to cancel an offered train type in:

13435 XYZ 123

again and press ZNL to delete the number in the offering block descriptor.

Accepting and Refusing Trains

When a neighbour offers a train to you, the ZNP801 will show you a display similar to the following:

08:11 37831 XYZ 251

This means that the dispatcher of the neighbour XYZ is wanting to send train 37831 to you via track 251. If you want to accept the train, press ANN. The display now shows

08:11 37831 XYZ 251 ANN

which indicates you have chosen to accept the train. To actually send your decision, press the ZNS button. The blinking "3 7831" value will now become solid. If you want to refuse the train, simply press ZNL. The blinking "3 7831" will disappear completely. The neighbour will likely try again in a few minutes.

Changing Train Numbers

Sometimes it is necessary to manually change train numbers on the panel.

Changing an Existing Number

To change an existing number, type the current number, followed by the T button. This adds a dash "–". Then, type the new number. The command string should then look something like this:


Pressing ZNS executes the action.

Setting a New Number

To set a number, the ZNP801 needs the train number, the local station code, and the track number:

12345 B 204

The local station code is like a neighbour station code but instead refers to your own station.

Deleting a Number

To delete a number, simply type the number, and press ZNL.

Clearing the Input

If you make a mistake or decide not to complete an action, clear the commands using the LOE button.

Track Availability Indicators

To help a dispatcher remind about the status of a track or to indicate to the supervisor dispatcher the availability of a track, the ZNP system allows you to enter Track Availability Indicators (TAI).

Again, this are only reminders and have no effect whatsoever on the interlocking system.

The following Track Availability Indicators are available:

  • 00000 = track is out of service
  • FFFFF = track is out of service for electric trains
  • 0F0F0 = track is not available / track is occupied without train number

If you enter a TAI into a track, that already contains a Train Number, the TAI will be stored in the track. As soon as the train number disappears, the TAI will appear again.

If you enter a Train Number into a track, that already contains a TAI, the TAI will be stored in the track.As soon as the train number disappears, the TAI will appear again.

TAI do NOT jump with signals. To remove a TAI, you must explicitly enter in the station code and the track number.

Further hints for entering the steering number

  • entering 112 results in train number 112 (A steering number is NOT specified)
  • entering 100012 results in Steering number 1 with train number 12. Thus 1 12.

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