The Z21 runs any DCC brand regardless of manufacturer; the CS3 adds automatic mfx registration for Märklin and Trix locos. Which suits your layout?
The black Z21 from Roco/Fleischmann and the Märklin CS3 (art. 60226) or CS3+ (art. 60216) are both solid digital command stations — but they serve different audiences. The Z21 is brand-agnostic: any NMRA DCC loco from Roco, Fleischmann, Piko, Brawa or any other brand runs on it. The CS3 is the heart of the Märklin/Trix ecosystem and adds mfx auto-registration: new locos register themselves automatically and transmit their function descriptions. That feature is unique — but limited to locos with an mfx decoder on a Märklin CS.
If you mainly run 3-rail Märklin locos and want the full Märklin experience, choose the CS3. If you have a mixed fleet from multiple brands or want brand independence, choose the Z21.
| Z21 black (art. 10820) | Märklin CS3 (60226) / CS3+ (60216) | |
|---|---|---|
| Protocol | DCC (14/28/128 steps) + Motorola MM I/II | mfx, mfx+, DCC, Motorola (no Selectrix) |
| mfx auto-registration | Not supported | Yes |
| Track current | 3 A, 12–24 V adjustable | CS3: 3 A / 60 W (HO/N) · CS3+: 5 A / 100 W (also scale 1) |
| Built-in S88 | No | CS3+: yes · CS3: no (requires Link S88, art. 60883) |
| Feedback buses | R-BUS (max. 160 blocks), CAN, LocoNet, X-BUS | CAN, S88 (CS3+ built-in) · LocoNet: to be confirmed on a layout |
| Max. functions/loco | Depends on decoder | Maximum 32 |
| Accessory addresses | 2048 (DCC) | 320 (MM) / 2048 (DCC) |
| ModelRailPro connection | UDP 21105 (Z21 LAN) — works | UDP 15731/15730 (Märklin CAN) — to be confirmed on a layout |
| Guide price | ~€250–350 (indicative) | CS3 ~€270 · CS3+ ~€350 (indicative) |
The black Z21 supports DCC (14/28/128 steps) and Motorola MM I/II. No mfx — but that is not a limitation if you use DCC decoders. Any NMRA-compliant decoder, from any brand, runs on the Z21. Feedback via R-BUS (max. 160 blocks), CAN, LocoNet and X-BUS. RailCom cutout present for RailCom decoders. Track current 3 A, voltage 12–24 V.
ModelRailPro connects via UDP port 21105. The Z21 integration is in active use.
The CS3 (art. 60226) and CS3+ (art. 60216) support mfx, mfx+, DCC and Motorola — but not Selectrix. The distinguishing feature is mfx: new locos register themselves automatically at the CS3 and transmit their name and function descriptions. This makes setting up a new loco on a CS3 considerably easier than on any other command station.
Track current: the CS3 delivers 3 A / 60 W (suitable for HO and N); the CS3+ delivers 5 A / 100 W (also for scale 1 and larger layouts). Maximum 32 functions per loco; accessory addresses: 320 (MM) or 2048 (DCC). The CS3+ has a built-in S88 port; the CS3 itself does not and requires a separate Link S88 (art. 60883). Whether the CS3/CS3+ has LocoNet is to be confirmed on a layout. The CS3+ has a colour touchscreen; the exact size (presumably 7") is to be confirmed on a layout.
ModelRailPro connects via Märklin CAN over the network (UDP 15731 / 15730). The implementation is complete and the status is ready — to be confirmed on a layout.
Also comparing with DCC-EX? Read Z21 vs DCC-EX. For decoder information, see the loco decoder guide.
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