Our exhibition locomotive has now received an updated installation with the CTC locomotive module M3:

Notes:

• The previous conversion (shown up to and including April 2025) can be found here
• We can perform all soldering work (IR receiver and buffer capacitor) for you (see options in the shop).

The locomotive’s housing is secured with four screws accessible from below (under the bogies).

The original decoder—or in my case, the old CTC locomotive module 21mtc and the old IR receiver—were removed. The Uhlenbrock IntelliSound 6 (32600), already used in the last conversion, is unplugged from the old module and connected to the new one.

The IR receiver is placed next to the bogie without a pick-up and secured with double-sided adhesive tape:

The smaller plug of the IR receiver for the CTC locomotive module M3 increases the likelihood that it can be routed through the housing without drilling. Here, I was able to simply thread it through the bogie:

The speaker is connected to the locomotive’s circuit board:

Since I need to connect it to the SUSI module, I desolder it from the locomotive’s circuit board and connect the cables to the SUSI module’s speaker wires. The 1000 µF buffer capacitor is soldered to the rectifier of the CTC locomotive module. Then, I connect the SUSI module and the IR receiver to the CTC locomotive module M3, and the wiring is complete:

Finally, I plug the CTC locomotive module M3 onto the 21mtc connector of the locomotive’s circuit board and close the housing. The result now looks significantly tidier than with the previous conversion using the older CTC locomotive module 21mtc (see the photo at the very top).