Authorised Retailer/Installer



  Sales and DCC Repairs
Esu Sound Decoders
SoundTraxx DCC Decoders
TCS DCC Decoders

DCC Solutions

  For DCC and Sound Installations 


Auscision 421 Class DCC Sound Installation

with Lighting Modifications

Now available with our NEW Remastered
ESU LokSound 5 Custom Sound Project 
with the "Full Throttle - Drive Hold" feature.

About the 421 Class

The 421 class are a class of mainline diesel locomotives built by Clyde Engineering, Granville for the New South Wales Government Railways in 1965-1966. The 421 Class featured the classic bulldog nose at one end, and featured a flat-cab at the other end.

The 421 class initially entered service on 22nd December 1965 when the NSWGR took delivery of 42101, the first unit of an order for ten locomotives, running on the Main South line before being transferred to Bathurst in 1970 to operate services on the Main Western line between Lithgow and Broken Hill including the new Indian Pacific service. However due to their poor ride quality, they were returned to the Main South. In 1982, locomotives 42102, 42103, 42104, 42106 and 42109 were seen being used on services in Victoria on a regular basis. They were later banned in Victoria by May 1983.

Some 21 years after begin their service, all 10 were withdrawn from service in December 1986 and January 1987 and put in storage at Junee Locomotive Depot, even though some had only recently been overhauled. In 1990 most of them were offered for sale. Four locomotives were purchased by Northern Rivers Railroad and continued to operate but in March 2002, all were included in the sale to Interail to QR National who regularly operated them as far south as Melbourne. Three were withdrawn and placed in storage in January 2013 with one remaining in service.

By the end of 2014, only 1 is in service (42103), 2 are preserved (42101,42102), 4 are stored  (42105/06/07/09) and 3 have been scrapped (42104/08/10)

DCC with Sound and Lighting Modifications

In August 2015, Auscision released the 421 Class locomotive which includes a 21 Pin socket for fitting a DCC decoder plus a speaker enclosure that suits a 20x40mm speaker. There are micro switches under the model for turning lights on/off in DC. In DCC all lights operate directional.

A second release of the model was done in May 2017 and was the same as the first release.

For this installation we recommend the ESU LokSound 5 (Sound) with our Custom Sound Project for the 421 Class or the LokPilot V4.0 (No Sound) for those not wishing sound.  We offer several options of DCC installations for this model to suit all budgets and can supply the decoders only for the DIY installers.

We have tweaked the motor control of the ESU decoder to provide super slow smooth speed which is perfect for shunting operations allowing the loco to move ever so slowly towards its rolling stock. Also, for those wanting the locomotive to move off slowly and build up speed like the prototype. You will be impressed with the smooth slow speed motor control.

We offer a light modification for this 421 Class Model to separate the lights for a more prototypical operation.

We can separate the headlights, white markers and red marker lights for a more prototypical operation . Each pair of front and rear marker lights can be controlled individually so when the locomotive is standing in a siding or shunting it can have both front and rear red markers on at the same time as per NSWGR practice. Also, you can have no rear markers on when pulling a load or simply just have the front white markers switched on. The front and rear headlights operate directionally and have a Low Beam/High Beam function.

You can also still operate all the lights directional as the way the model was delivered. 

For a Standard Light Modification we can separate the lights as follows:

1) Headlights - directional with 1 function button
2) Marker Lights - directional with 1 function button
3) Front Headlight - on/off with 1 function button

4) Front White Markers - on/off with 1 function button

5) Front Red Markers - on/off with 1 function button

6) Rear White Markers - on/off with 1 function button

7) Rear Red Markers - on/off with 1 function button

With our light modifications you can operate the lights on your model locomotive closer to the real thing! 

The DCC Solutions NSW 421 Class Custom Sound Project 
is packed with sounds and features n
ot found on other sound decoders especially factory fitted sound.

Factory Fitted Sound only offers you the very basic sound for your model 

So why not get fully featured sound from DCC Solutions

Our Custom Sound Project now includes these fantastic features:

Full Throttle – Drive Hold

This feature allows you to simulate a loaded or empty train by pressing the F1 function button. When the button is pressed, the motor will remain at a constant speed, while the sound can be controlled independently by adjusting the speed on the throttle. This exciting, new feature gives the operator the ability to have the train crawl in notch 8 or coast at 100 km/h. Release the Drive Hold function button and you simply go back to throttle-controlled speed and motion. Available only from DCC Solutions, our Drive Hold will stop your loco when you reduce the speed to zero even while the function is still active. Your ESU factory fitted or downloadable sound will not stop your loco at speed step 0 with the drive hold on.

Coasting on Demand
This feature allows you to enter coasting mode whenever you want with a press of a button. Often when coming to a stop, the throttle of a real locomotive is put into Idle and the locomotive coasts to a stop. Another situation that occurs is that once a train is up to speed when operating over the
NSW's countryside, the driver can coast to maintain a certain speed. By pressing the coast function button, the sound drops into coasting and remains there. Using the throttle speed control, you can now speed up or slow down the train with the sound remaining in coasting mode.
Press the function button to exit coasting and the sound will exit and return to whatever speed is set when exiting.

Working Brake

Press the Brake Function button and your locomotive will come to a stop at a much shorter distance than if you were to bring it to a stop by reducing the throttle speed. Release the brake and your locomotive will move off again or choose to have it remain stationary when the brake is released.

Working Dynamic Brake

Apply the Dynamic Brakes and the Prime Mover will wind down to idle while the Dynamic Fans engage to assist with cooling. Reduce the throttle and the decoder's dynamic braking logic will reduce your speed faster than normal. Disengage Dynamic Braking and the primer mover will returned to it's notched speed and the fans will turn off. 

Random Start-up Sequences with Move Off and Stopping Sounds

Now with random start-up sequences including hot or cold engine starts your start up and shut down will not always sound the same.

As your locomotive begins to move off you will hear the sounds of brakes releasing with random speed activated wheel squeal, rail noises and other sounds. Some of these sounds are random or speed sensitive that will turn on/off automatically depending on your take off speed. When the locomotive comes to a stop you will hear the squeal of the brakes, air releases and then the compressor will cut in automatically to fill the reservoirs with air until full and will cut out.

Coupling and Release with Shunting Mode
Activate coupling or release and your loco will automatically reduce its speed to allow for a more realistic coupling or release operation. Once the operation is completed your loco will continue to run at slow speed for a few more seconds before returning to the speed set on your throttle.

Manual Notching

For those who really want to drive their train and manually control the notching rather than letting the decoder do it.

Remastered Horn Sounds

NSWGR WABCo A/B Series playable and short blast horn.

Random Sounds
While the factory fitted or other sound decoders will only offer you 1-2 random sounds, DCC Solutions will have up to 12 random sounds that will play when either the loco is stopping or moving as we have been doing for years in all our Custom Sound Projects.
And includes all these great features to make your Auscision 421 Class drive and sound impressive.
  • EMD 16-567C Roots Blower Prime Mover.
  • NSWGR WABCo A/B Series Short Blast and Playable Horn 
  • Random Start-up sequences including Automatic Hot or Cold Engine Start.
  • Air and Brake Release Sounds when loco moves off and stops including Brake Squeal.
  • When the loco stops after braking the compressor cuts in to fill the reservoir and will turn off when the tanks are full.
  • Speed sensitive Wheel Squeal and Rail Noise when the loco moves off.
  • Full Throttle Drive Hold - Lock the loco speed and control the sound independently to simulate a heavy loaded or empty train
  • Proper Working Dynamic Brakes: The prime mover winds down to idle, fans activate and brakes faster due to Dynamic Brake motor logic 
  • Coasting On Demand
  • Working Brake to bring your locomotive to a stop even when Full Throttle Drive Hold is active unlike other ESU sound files.
  • Manual Notching - manually control the notching rather than letting the decoder do it
  • Brake Squeal On Deceleration
  • Directional Coupling and Release with brake line release with auto active shunting mode to reduce the speed of the loco for shunting
  • Stop & Drive Random Sounds including fans, compressor, rail noise, track wheel squeal, air releases and more!
  • Manual Ratchet Handbrake
  • Modified Lighting Option for more prototypical light operation
  • Low beam to High beam Headlight operation
  • And more (See below for full list)
  • Play 10 different sounds simultaneously
  • Motor settings and sound volumes tuned to specifically suit the Auscision 421 Class Locomotive Model.
  • Individual sounds slots and master sound volumes can be adjusted by the user to suit personal requirements.
  • Full function button remapping to suit your personal requirements.
  • This Sound Project is also suitable for other brands of 421 Class Models.


Standard DCC Installation: ESU Non sound decoder with no lighting modifications.

Standard Sound Installation: Alternate brand of sound decoder with factory generic sound. No lighting modifications.

Premium Sound Installation: ESU LokSound 5 sound decoder with our custom EMD 16-567C sound project. No lighting modifications.

Premium Sound Installation and Light Modification:  Upgraded 6 Function lighting outputs with the DCC Solutions light modification and our custom EMD 16-567C  sound project that allows you individual control of the front/rear white marker lights, front/rear red marker lights, front and rear headlights using the function buttons on your DCC throttle.

Here is the selection of sound and function labels using the ESU LokSound 5 with 6 Function Lighting Outputs.


Premium Sound Installation and Light Modification

Function                      Description   
      0  (HEADLIGHT)       Directional Headlights

      1                             Full Throttle Drive Hold

      2  (HORN)                 Playable and Short Blast Horn

      3                             High Beam Headlight

      4                             Dynamic Brakes

      5                             Coasting on Demand

      6                             Brake

      7                             Brake Squeal on Deceleration               

      8                             Prime Mover Cold/Hot Start Up/Shut Down

      9                             Front White Markers

    10                             Rear Red Markers

    11                             Rear White Markers 

    12                             Front Red Markers

    13                             Directional Markers Lights

    14                             Reserved      [For Light Mods] 

Function                      Description 
    15                             Fan   

    16                             Compressor

    17                             Coupling/Uncoupling + Shunting Mode

    18                             Wheel Squeal

    19                             Guard's Whistle

    20                             Sanders

    21                             Volume Fader - Reduces Sound 50%

    22                             Front Headlight On/Off

    23                             Hand Brake Ratchet Set/Release

    24                             Spitter Valves

    25                             Manual Notching

    26                             Notch Up / Short Air Release

    27                             Notch Down / Cab Door

    28                             Rail Clank

Note: The above functions are for the LokSound 5 Decoder programmed with DCC Solutions Premium Custom Sound Installation with Light Modifications.
 To learn how to use these functions see the Info & Help page. 
All functions can be reprogrammed to suit your own personal requirements.

Options Available 

ESU LokSound 5 Sound Decoder programmed with DCC Solutions Custom 421 Class Sound Project

ESU LokPilot V4.0 (Non Sound Decoder)

Alternative brands of Sound and Non Sound Decoders of your choice.

DCC Solutions upgraded 6 Function Light Modifications

Supply only Decoders and Speakers for DIY Installations