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  DCC Solutions

IDR Models NSW 70 Class

DCC Sound Installation with Stay Alive

Now available with our NEW Remastered

ESU LokSound 5 Custom Sound Project

with the "Full Throttle - Drive Hold" feature.

DCC Solutions is recommended by IDR Models for Sound

70 Class Models Now Available from IDR Models - Click Here to Purchase

About the NSW 70 Class Locomotive

The NSW 70 class were a class of diesel-hydraulic locomotives built by Commonwealth Engineering, Granville for the New South Wales Government Railways in 1960-61. They were ordered to replace steam locomotives at Port Kembla. Only 10 units were built with the first locomotive, 7001, entering service on the 15th of August 1960 and the last to enter service, 7010, on the 11th of May 1961.

The 70 Class were a very different type of locomotive. They were diesel-hydraulic rather than diesel-electric. But the most obvious difference was they were of an 0-6-0 design rather than a more conventional Bo-Bo or Co-Co wheel arrangement. Their light axle load was specified to allow them to work on the industrial branch and wharf lines in Port Kembla (Near Wollongong, NSW) where they would spend most of their working life around that area. They were also seen shunting around other yards in Sydney including Darling Harbour and Chullora while occasionally used as passenger trains. The 70 class had been found to travel as far as Casino in northern NSW.

On 10 February 1984, 7009 was taken out of service and sent to Eveleigh Railway Workshops with 7008 following on 21 June and 7002 on 13 August, all three were officially withdrawn. On 12 November 1984, the 73 class took over all shunting and transfer duties at Port Kembla resulting in only 3 of the 70 class locos to remain operational. On 10 September 1986, loco 7010 last operated and 7006 stopped the following day bringing an end to the NSW 70 class in operation.

Two of the 70 class locos are preserved, 7007 and 7010 with 7006 and 7008 being preserved-operational.

The NSW 70 Class from IDR Models

DCC with Sound and Light Modifications

In September 2018, IDR Models released the NSW 70 Class Locomotive which includes an 8 Pin socket for fitting a DCC decoder.

In DCC the Headlights and Marker Lights will operate directional.

For this installation we recommend the ESU LokSound 5 (Sound) or the LokPilot V4.0 (No Sound) for those not wishing sound.

We offer DCC or DCC with sound including a Stay Alive Device to enable uninterrupted performance at super slow speeds especially travelling through insulfrog points.

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 70 Class to separate the Red Markers for Shunting 

The IDR 70 Class lighting inside the model allows us to separate the red markers from the rest of the lighting allowing for individual control resulting in you being able to have red markers on at both ends while shunting in a yard,

DCC Solutions Lighting

For an upgrade to 4 Function Standard Light Modification we can separate the lights as follows:

1) Front Headlight with White Markers - directional with the headlight button or on/off with 1 function button (Not Directional)

2) Rear Headlight with White Markers - directional with the headlight button or on/off with 1 function button (Not Directional)

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

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

5) Directional operation for all lights.

The DCC Solutions 70 Class Custom Sound Project packed with sounds and features not found on other sound decoders

Others will only offer you the very basic sound or not the correct sound

So why not get fully featured sound from DCC Solutions

Our Custom 70 Class Sound Project now includes these great 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 sound will not stop your loco at speed step 0 or by trying to use the brake with the drive hold on. So watch out you don't crash your loco.

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

rolling 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.

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.

Random Sounds

While the factory fitted sound will only offer you 1-2 random sound, 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.

Brake Squeal on Deceleration

Activate this function and when you reduce the throttle speed quickly your locomotive will slow up quicker than normal for a short period and you will hear the squeal of the brakes just like if you where to apply and release the brake.

And includes all these great features to make your IDR 70 Class drive and sound impressive.

  • Caterpillar D397 Prime Mover Sound
  • 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
  • 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.
  • Brake Squeal on Deceleration that slows up your loco.
  • 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!
  • Wheel Squeal
  • Guard's Whistle
  • And more (See below for full list)
  • Play 10 different sounds simultaneously
  • Modified Lighting Options for more prototypical light operation.
  • Low beam/High beam Headlight.
  • Motor settings and sound volumes tuned to specifically suit the IDR 70 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.
  • DCC Solutions High Performance Dynamic Speaker with enclosure producing fantastic sound.


Standard DCC Installation: Non-sound decoder

Premium Sound Installation.: ESU LokSound 5 with our own 70 Class Caterpillar D397 Custom Sound Project.

Premium Sound Installation with Light Modifications: Separate the red marker lights for more lighting options plus our Custom 70 Class Caterpillar D397 Sound Project.

Here is the selection of sound and function labels using the ESU LokSound 5 Sound Decoder


Premium Sound Installation with Light Modifications

Function                       Description  

0 (HEADLIGHT)           Directional Headlights

1                              Full Throttle Drive Hold

2  (HORN)                        Horn

3                              High Beam Headlight

4                              Reserved (Dynamic Brakes in other DCCS Sound Projects)

5                              Coasting on Demand

6                              Brake

7                              Brake Squeal on Deceleration

8                              Prime Mover Start Up/Shut Down

9                              Reserved - For Front White Markers

10                              Rear Red Markers

11                              Reserved - For Rear White Markers

12                              Front Red Markers

13                              Red 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                              Sanding Valve

21                              Volume Fader - Reduces Sound 50%

22                              Front Headlight

23                              Reserved

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 ESU 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 70 Class Sound Project

ESU LokPilot V4.0 (Non Sound Decoder)

Stay Alive Device

Light Modifications

Supply only Decoders and Speakers for DIY Installations

Click Here to contact DCC Solutions to enquire about DCC with Sound for your 70 Class Locomotive