Guide

DCC vs DC

Analogue DC is simple and cheap. DCC lets you drive several trains independently on the same track, with sound and lights. Here’s how to choose.

How analogue DC works

With traditional analogue control, the controller varies the voltage on the track (typically up to 12V DC). More voltage, more speed; reverse the polarity and the train reverses. Every locomotive on a powered section of track responds together, so to run two trains independently you split the layout into electrical sections with isolating switches, or use two controllers on two separate loops.

Most train sets come with a simple analogue controller, and a good analogue controller (for example a Gaugemaster Combi) gives much smoother slow running than a basic set controller.

How DCC works

Digital Command Control (DCC) puts a constant digital signal on the track. Each locomotive has a small decoder with its own address. The command station sends instructions to a particular address, so you can drive loco 3 forwards slowly while loco 47 runs the other way at full speed, on the same piece of track, with no isolating sections.

DCC also controls lights, sound and functions, and can operate points and signals through accessory decoders. Hornby’s HM7000 decoders can additionally be driven from a phone or tablet over Bluetooth.

Pros and cons

	Analogue DC	DCC
Upfront cost	Low	Higher: controller plus a decoder per loco
Wiring	Simple for one train, gets complex with sections	Simpler for multiple trains, but needs good power feeds
Several trains at once	Needs sections or separate loops	Yes, anywhere on the layout
Sound and lights	Limited	Yes, fully controllable
Second-hand locos	Run as bought	May need a decoder fitting

DCC ready, DCC fitted and sound fitted

DCC ready: the loco has a decoder socket (commonly 8-pin, 21-pin, Next18 or 6-pin) but no decoder. It runs on analogue as bought; plug in a matching decoder for DCC.
DCC fitted: a decoder is already installed. Usually still runs on analogue too.
Sound fitted: has a sound decoder and speaker. Most expensive, most impressive.

Always check the socket type in the product listing before buying a decoder. Hornby often uses codes ending in TXS for sound-fitted versions.

What it costs

A decent analogue controller costs far less than a full DCC system. DCC costs add up: a command station, then a decoder for each loco (more for sound decoders). For a layout with two or three locos, analogue is cheaper; once you have many locos and want to run several at once, DCC starts to earn its keep.

Which should you choose?

Choose DC if you’re starting with one train set, want to keep costs down, or mainly run one train at a time.
Choose DCC if you want to run several trains together, love sound, or are starting a layout from scratch and want simpler wiring for multiple trains.
You can start on DC and move to DCC later: buy DCC-ready locos and they’ll be easy to convert.

Safety tip: don’t connect an analogue controller and a DCC system to the same track at the same time. Disconnect one before connecting the other.