![Scale Trains SD40-2 RailPro 1.jpg](https://rpug.pdc.ca/index.php?PHPSESSID=2eufcedpljuqn2cf89b656oi82&action=dlattach;topic=400.0;attach=605;image)
![Scale Trains SD40-2 RailPro 4S speaker.jpg](https://rpug.pdc.ca/index.php?PHPSESSID=2eufcedpljuqn2cf89b656oi82&action=dlattach;topic=400.0;attach=607;image)
![Scale Trains SD40-2 RailPro Chassis.jpg](https://rpug.pdc.ca/index.php?PHPSESSID=2eufcedpljuqn2cf89b656oi82&action=dlattach;topic=400.0;attach=609;image)
msg=3016] msg=3016]Scale Trains new SD40-2s arrived in the mail yesterday. Unfortunately it's not an off the shelf install as there's no room for a LM module.
This is what I did. Remove the PC board. You will need to unsolder the motor and truck wires. Mill or cut down the rear of the weight to the level with the PC board area.
You will see there's a cavity under this area for a speaker. I cut down an iPhone 4S one and used double sided foam tape to hold it in place.
With the 9 to 21 pin adapter you will have control of, the white marker lights, Number boards and both headlights.
I have been in contact with Scale Trains to find out which one of the 21 pins feed the beacon, green and red marker lights. It should be possible to feed the 21 pin plug to get the beacon plus the red marker lights operational using the outputs from the rear of LM module.