https://dccwiki.com/Can_the_UT-4_be_upgraded_to_UT-4R%3F FAQ:Can the UT-4 be upgraded to UT-4R? - DCCWiki

FAQ:Can the UT-4 be upgraded to UT-4R?

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According to the Digitrax website, it is possible to upgrade the the UT-4 throttle to a UT-4R (Radio). Contact Digitrax for pricing and details (and then update this with any additional information).