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I converted the old BR 110 025-4 from GDR production (built by Gützold, sold under Piko) for digital operation. Of course, this involved a certain amount of effort, but otherwise it would be taken out of service. Parts used: - Motraxx SF135 motor (5-pole, 13000 rpm, 10-13V, approx. €14) - Piko locomotive board ET59400-12 (NEM652 interface, approx. €14) - Piko cardan shafts including cardan mount/shells (2x approx. €5) - 2x LED (MS4 design, warm white, 22V AC/DC) - Copper wires - Decoder for NEM652 (e.g. ESU Lokpilot V4 micro, ZIMO MX616R, ...) Although the extra cardan shafts may not even be necessary. Most of the conversions correspond to the scheme for my BR 118 ( • Gützold/Piko BR 118 117 conversion/digital... ). Some points are discussed in more detail there. Important note: Pay attention to the heat generated by the motor. Avoid short circuits at all costs. Limit the amount of cable clutter. The capacitor mentioned also caused problems with other decoders, so it should most likely be removed in any case. Please solder carefully. Circuit boards and electrical components can be damaged or destroyed by holding the soldering iron for too long (i.e. heat). As it turns out, the circuit board is suboptimal. In this case, it worked in conjunction with Zimo and digital operation, but sometimes in analogue operation it seems as if there are contact problems - it jerks and the light flickers too. The phenomenon is definitely related to the circuit board. Unfortunately, I have not yet found any other Piko model of the same size. All information without guarantee. Conversion at your own risk. Link to the circuit board structure: https://abload.de/img/platine_piko594...