Yes, it's called an RF Choke, however, the K-Line cabooses don't need it. As a general rule, they don't interfere with the DCS signal. The cabooses that often do are from Atlas O.
While it is apart you might want to install a 3A diode in series with the smoke unit. K-line caboose smoke units sometimes melt the roof when run on the higher voltage of DCS. After seeing some melted ones at train shows, I did this to mine. It smokes just fine after the change. Here is a nice blog article about it.
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