Term: Dispatch

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Summary: Dispatch is a command in the LocoNet language, used on Digitrax systems. The Dispatch command releases control of the locomotive from the throttle, making it available to another throttle. Only one address can be flagged as dispatched in the system. By pressing ACQ (ACQuire) on your throttle you can take control of the dispatched address.


When you dispatch a locomotive or consist, it is made available for other throttles to use. The first throttle requesting it via the ACQ (Acquire) key will gain control of that address. This allows other throttles, such as operator throttles to gain control. This will allow a throttle which cannot create consists or access 4 digit addresses to take control easily.

If using a wireless throttle, it must be plugged into the LocoNet to perform these operations. Duplex throttles may be able to perform this operation without being plugged in.

This process is not the same as releasing an address. The slot is still available for other throttles to take control of the locomotive.

Zephyr / Zephyr Xtra / Zephyr Express

To perform a dispatch, refer to your manuals, as each system has differences in the procedure.

DT400 DT402 DT500 Advanced Throttles

It is recommended that you set the speed to zero prior to dispatching, to avoid runaways when it is acquired.

To dispatch a locomotive using a DT400 throttle, press LOCO and browse to the address. Then press the DISP (DISPatch) key.

  • For the DT500, press the LOCO key again to go into select mode, then DISP.

Refer to the manual as there may be differences in the procedure.


  1. While un-plugged press and hold the DISP button then plug in the UT4 to the throttle network.
  2. There should be a solid red light. You are now dispatched.
  3. Unplug the throttle, then select another locomotive address. There is no need to turn the dials while your plugged in. The DISPatch key does the selection internally.

Releasing a Slot

Releasing a slot is not the same as dispatching. Read the manual for your throttle as there may be differences between Digitrax Advanced Throttles

When a locomotive address is released, the slot it was using is also cleared and made available to the system for use. It will not be available for another throttle to use. The command station is free to reallocate that slot at any time. Using software such as JMRI's Slot Monitor may show the slot is still in use.

The process is similar to dispatching. With the locomotive speed set to zero, and the locomotive information displayed on the LCD, press the LOCO key. The address will begin to flash. If you wish to Dispatch the loco, press DISP. The command station will flag that slot as Dispatched. The display should indicate that selecting an address is possible.

IF LOCO is pressed again, the last address will appear and flash. That address can be selected by pressing the LOCO key, or another address can be selected using the throttle knob or the keypad.


Dispatching can be used to allow consists and four digit addresses to be used by throttles lacking those features. The consist can be created by one throttle, then dispatched and subsequently be acquired by another throttle. Or a locomotive with a 4 digit address can be acquired by a throttle not capable of using four digit addresses.

Some operators prefer that all addresses be dispatched upon completion of an operating session. This prevents any unexpected results when the layout is powered up at a later time.