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They don’t on any of mine. Once again, this is basically the venerable Life-Like mechanism retrofitted to take the sound decoder PCB, the speaker, better pickup springs, and the new PCB SMLED-equipped light board in the nose to upgrade the original light bulb and add numberboard illumination. I followed the same frame modifications Atlas did to digitize and add sound to a Life-Like FB-2. Every other component (other than the windshield that was retooled because the original tooling was either damaged or lost), is exactly the same as the original Life-Like release - including the truck frames and the fuel tank.
The only good news is the 2nd run FA1s run faster at top speed than the 1st run, but the sound is still weakly pathetic. The contact between the decoder board and one of the motor brushes is broken on my loco. I had to disassemble the entire loco to find this out. Be great if Atlas would send me two new contact strips, but ......
So you like fast running locos? That's loco.
The only good news is the 2nd run FA1s run faster at top speed than the 1st run, but the sound is still weakly pathetic.
Just curious, @OldEastRR ... since you seem to have a different experience from most of the other posters, did you buy your units brand new, or used (or rebuilt, refurnished, pre-owned, or some other way where someone might have messed with the CVs or added a resister in the wrong place)?