Mostly I use two handhelds when running DCS trains, and each has had a helter-skelter collection of both steam and diesel engines loaded. The result is mostly you have no idea which handheld to grab, and it seems like you always pick the wrong one first. So finally today I separated them into one handheld for steam, the other for diesel. Way easier to figure out and I blew away all the duplicates from both. Much faster now to find the engine you want; wish I had thought of this years ago. 
Simple idea but it took along time to land on it.
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