If you are doing a difficult DCC install such as installing a speaker into the tender of a steam loco you have probably already worked out that its better to use a little plug and socket so that the tender and loco can still be separated.
Micro Plug & Socket Connector For Hornby Tender Connection, Bachmann Oxford Rail
Micro Plug & Socket Connector 6 Pin For DCC & Lights, Decoder TTS Zimo Loksound
Micro Plug & Socket Connector For DCC & Sound, Speaker Decoder TTS Zimo Loksound
Micro Plug & Socket Connector 5 Pin For DCC & Lights, Decoder TTS Zimo Loksound
Micro Plug And Socket Loco To Tender Connection, Hornby, Bachmann, DCC Sound Etc