Couplers, Tethers, Speakers, etc.


Many ERR and Royz Trains TMCC Upgrade & Support Items.  We do these upgrades on all O Gauge/Scale manufacturers’ engines.  Specialty are the brass engines from Sunset Models, Weaver, and Williams.  The items in this section are offered to enhance your upgrade to a one of a kind engine!

Additional Support Items.  Below is a partial list of additional items you may need to successfully complete you upgrade to TMCC using ERR and Royz Trains Products.  If you don’t see something you need, please Contact Us. as not everything in stock is listed.  We also offer a FAQ lessons learned list with your order to help minimize unexpected challenges. We offer a cherry switch board to support synchronized chuff between steam engine cherry switch and steam sound boards.  Additional items are available beyond those shown. Contact Royz Trains direct for specific price based on application.

Need an R2LC, older sound plug-in board, or sound power supply? We have a selection of used items that have been checked out and are available for purchase. Drop an email to us with your needs.

What are you working on?  When emailing, include the engine type, manufacturer, and any information regarding what you would like to do.  I will get back with you with answers, cost and other options for your consideration.  Most common items are kept in stock.


We offer various items to support your TMCC upgrade using the array of ERR products, Lionel couplers,  speakers, and tethers.  These are augmented by custom items from Royz Trains in the form of LED lighting and smoke units.  When ordering, you will also receive a FAQ list to help reduce challenges during your installation.

We have about 10 different coupler types for various installations.  Length of coupler is the full physical length (not just to the mounting hole).   Only the three most common types are listed in the drop down menu.  If you need something different please contact us

Tethers come in three types.  The four pin version is identical to that used with simple installations and the older QSI applications.  The Six pin version is great for installations using the AC Commander as the two parts will hang between the engine and tender.  The Ten pin is a full harness for steam engine upgrades and included wiring, plugs, a replacement for the male connector below the cab deck, and separate harness for engine body to support smoke, headlight, and marker lights.

Speakers come in a couple different sizes.

Don’t see what you are looking for or have a question?  Drop us a line at  

Additional information


ElectroCouper 1.85", ElectroCoupler 2", R2LC Receiver, ElectroCoupler 1.75", "Fat Boy" Speaker, Dual Speaker Kit, 16 Ohm Speaker, 8 Ohm Speaker, 4 Pin Tether, 6 Pin Tether, 10 Pin Harness, 2 Pin Pair, 3 Pin Tether


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