Train Control Systems decoder (WOW) owners know about the Keep Alives available for their decoders. Known as KA1 through KA4, they have various shapes which allow them to fit in various locomotive shells depending on the room available for them. The most popular are the KA3 and KA4.
The KA3 has the capacitors arranged inline (25.9mm x 11.43mm x 8.81mm).
The KA4s' are arranged in a square (13.22mm x 13.22mm x 11.55mm).
Soundtraxx has their Current Keeper with 5 capacitors (40mm x 6mm x 11mm). The good news is SoundTraxx has finally caught up to Train Control Systems. They reduced the foot print of their Current Keeper by arranging the 5 capacitors as close to a square as they could (20.1mm x 13.2mm x 11mm).
This is a good reduction in size for the Current Keeper and given the odd number of capacitors it's the best they could do. It is currently in stores and available on line.
For those modelers with SoundTraxx equipped locomotives these would be a great fit (pun intended).
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