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Auscision 73 Class DCC Sound Installation

with Lighting Modifications

The 73 class are a diesel-hydraulic locomotive built by Walkers Limited, Maryborough, Queensland for the New South Wales Government Railways between 1970 and 1973.In October 1969 the New South Wales Government Railways placed an order for 20 Bo-Bo shunting locomotives. These were the only New South Wales locomotives to be built in Queensland. The first unit was delivered in October 1970. When the all of the 20 locomotives were delivered, all steam shunting on North Coast line, at Goulburn and the Sydney Metropolitan area had been replaced. In July 1971 a further 30 units were ordered and when the last of these arrived in March 1973 it brought to an end all remaining steam shunting operations in New South Wales.

The New South Wales Government Railways purchased the class mainly for shunting and their prohibition from mainline use was 'officially' due to the lack of vigilance controls. However, despite its absence, the class was still seen on many suburban trip workings and when mainline operation was a necessity, there seemed to be no hesitation to use them. Multiple unit operation was common and a number of units were fitted with exhaust gas scrubbers for use on Eastern Suburbs Railway construction in the 1970s.

With a reduction in locomotive hauled passenger trains and the closure of a number of yards, withdrawals began in February 1987. By October 1991 only three remained in service with FreightCorp. One was repainted into CountryLink livery for use as a depot shunter at the XPT Service Centre.

Disposals commenced in 1990 with three sold to the Canberra Railway Museum. Four were sold to Manildra Group in 1991, while many were sold to Queensland sugar cane companies. A number have also been preserved 7307, 7320, 7321,7324, 7329, 7335, 7344, 7350.

7301 & 7344 were placed on RailCorp's Heritage & Conservation Register. However, 7301 was subsequently scrapped in January 2014.

In all 15 remain in service, 8 preserved, 16 stored and 11 were scrapped.

The Auscision 73 Class was released in February 2013 as a DC model only. There was no provision for DCC and the model requires a complete rewire to correctly operate in DCC. Three switches located internally on the board enabled you to turn the headlights, marker lights and number board lights on/off in DC. To operate these lights in DCC the light boards require extensive modifications as they are not suitable for DCC operation and won't work.
The model is small and space is limited so for this installation we recommend the ESU LokSound Range of decoders, such as the LokSound V4.0 (Sound), LokSound Select (Sound) or LokPilot V4.0 (No Sound) for those not wishing sound.

We offer a light modification for this 73 Class to separate the lights for a more prototypical operation.

Upgrade to 6 Function lighting outputs with DCC Solutions light modifications and you will have individual control of the front and rear white marker lights, front and rear red markers using 4 function buttons on your DCC throttle. The front and read headlights/number boards will operate directionally with the headlight button on your throttle. For example, you can run your loco and be able to operate 1) Front Headlight  2) Front White Markers  3) Front Red Markers 4) Rear Headlight  5) Rear White Markers  6) Rear Red Markers Lights using individual on/off function keys. With this upgrade you can operate the markers as prototypical of a 73 Class Shunting Locomotive.

We have tweaked the motor control of the ESU decoder to provide super slow smooth speeds at steps 1-10 of 128 (Speed step 1 of 28) 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 have prepared a custom sound file for the LokSound V4.0 Sound Decoder with additional sounds.

Our Custom Sound Project is now available

The NSWGR 73 Class Custom Sound Project includes:

Two new features have been added to our Custom Sound Project. Coasting on demand and a working Independent Brake.

Coasting on Demand
This feature allows you to enter coasting mode whenever you what with a press of a button.Often when coming to a stop, the throttle of a real locomotive is put into Idle and the engineer coasts to a stop. Another situation that occurs is that once a train is up to speed when operating over
rolling terrain, the engineer can coast to maintain a certain speed. By pressing the coast function button, the sound drops from wherever you are to idle and remains there. Using the throttle speed control, you can now speed up or slow down the train with the sound remaining constant, at idle.
Press the function button to exit coasting and the sound will exit idle and return to whatever speed is set when exiting.
Independent Brake
Simply press the Independent Brake Function button and your loco will come to a stop at a much short distance than if you were to bring the loco to a stop by reducing the speed throttle.Press the function button to release the brake and your loco will move off again.

Plus these great features:

  • Caterpillar Prime Mover
  • Coasting On Demand
  • Working Independent Brake.
  • Short Blast and Playable Horn.
  • Random Start-up sequences.
  • 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.
  • Separate Coupling and Uncoupling Functions
  • Stop & Drive Random Sounds including, compressor, rail noise, track wheel squeal, air releases
  • Wheel Flange Squeal
  • Guard's Whistle
  • And more (See below for full list)
  • Light modification for individual light control
  • Low beam/High beam Headlight.
  • Motor settings and sound volumes tuned to specifically suit the Auscision 73 Class Locomotive Model.
  • Individual master sound volumes can be adjusted by the user to suit personal requirements.
  • Full function button remapping to suit your personal requirements.
  • Quality Cab Crew installed in the cab
  • DCC Solutions "MICRO" High Performance Dynamic Speaker which is only 4mm high with enclosure hidden on the cab roof that can't be seen through the cab windows producing fantastic sound.
    Here is the selection of sound and function labels using the ESU V4.0 sound decoder with 6 Function Lighting Outputs.


    Standard Light Modification and Sound Installation

    Function                   Description   
          0   (HEADLIGHT)         Directional Headlights/ Numberboards

          1                            Short Horn

          2  (HORN)                  Long Horn

          3                             Coupling

          4                             Uncoupling

          5                             Coasting On Demand

          6                             Independent Brake

          7                             Shunting Mode with Red Markers

          8                             Start Up/Shut Down/Mute

          9                             Front White Markers

        10                             Rear Red Markers

        11                             Rear White Markers 

        12                             Front Red Markers

        13                             Directional Marker Lights

        14                             Short Air Release

    Function                   Description   
        15                             Fan

        16                             Compressor

        17                             Manual Brake Set/Release On/Off

        18                             Wheel Flange Squeal

        19                             NSWGR Guard's Whistle

        20                             Volume Control (+/-) Double Key Press

        21                             Volume Fader - Reduces Sound 50%

        22                             Headlight High Beam

        23                             Cab Door Open/Close

        24                             Sanding Valve

        25                             Reserved

        26                             Manual Notching (Up)

        27                             Manual Notching (Down)

        28                             Disable Start Off and Stopping Sounds

    Note: The above functions are for the LokSound V4.0 Decoder programmed with DCC Solutions Custom Sound File. The functions and sounds will be different for the LokSound Select Decoder. To learn how to use these functions see the Info & Help page.

    Options Available                                                 

    Adding quality crew figures in the cab

    ESU LokSound SELECT Sound Decoder

    ESU LokPilot V4.0 (Non Sound Decoder)

    TCS Non Sound Decoder

    Soundtraxx Non Sound Decoder.