I think I have bought my last non-BB Athearn diesel. I bought an F3A/B set, and later the other F3A to run as an A-B-A. This is the Burlington Cal Zephyr passenger F's set. I had to take the three units to my LHS (which is one of the largest west of the Mississippi) to get them to consist and run at the same speeds. The Tsunami sound decoders and the downloaded instructions are pretty complicated, and nothing like the QSI decoder/instructions of other units. After getting the speed situation resolved, I found out that the headlight/Mars light settings have been screwed up (did the DSS expert reset everything to factory before fixing the speeds?). As it was, Athearn picked up some information that both upper and lower lights on the "Q" F3A units operated together! That just wasn't so, at least when I was riding and watching them as a kid. I rewired the upper lights to the F5 terminals on the decoder board, which allows me to turn on the Mars light independent of the headlight (lower), but there are still some weird things, such as the long horn sound being controlled by F2 and the short horn bleat by F3. I tried reprogramming F2 to get both long and short, but when I do a long blast, it is followed by a short blast. Back to the drawing board! Not only that, but, unlike the old BB Athearn F7's, where you removed the body from the chassis by simply spreading the bottom sides near the fuel tank, on the new stuff, you have to remove the couplers, then undo two screws at the rear end of the unit. To reassemble, you reverse the project. Getting those coupler pocket screws back in is a real pain. A magnetized small Phillips screwdrive is a must. I replaced the front couplers on both A units, with Kaydee #146's, and the rear with Kaydee #5's (or whatever ones have the centering whiskers that are equivalent.) Too bad Athearn isn't making dummy units, as I don't really need all the power in three units.