I've heard lots of hype recently about how realistic new locomotive sounds are. Some manufaturers are even bold enough to put examples on the net so we don't have to shell out just to find out if it's true. I had a chance to listen to the sounds on the BLI website a few times, but still keep coming up with major problems comparing model engine sounds to real ones. To qualify my perspective, I work in a RR tower and have locomotives pass by almost continuously. I can't comment on sounds such as bells and whistles as they might be realistic for a certain road, although not mine. The RSD-15 doesn't sound too bad starting up. The RPM seems to be almost reasonable, but as soon as it revs up it's not sounding like an alco at all. Not that I have too many alcos going by, but I did manage to get some ls&I video in the 80s and they sounded very much like our home grown 251s , throaty exhaust, low idle seemingly to sputter and die about every 10 seconds. This model is way off in that dept. The FA and PA model suffers the same ailment. F7 doesn't sound as good starting up, but gets right into the same problem as high RPMs make it sound like something sci-fi. I had a real GP outside today in run 8 going 4mph, I forgot what that sounded like. As a kid 4 Geeps used to power a run through freight in the middle of the night in my neighbourhood. What a sound, like rolling thunder! It's too bad nobody has replicated it yet.The shut down sequence almost has me fooled. It's pretty good. Maybe modellers can manipulate the sound to make it sound more realistic throughout all ranges? SD40-2. Sorry there is nothing on this sequence that reminds me of a SD-40-2, or a GP 30, or 35 or anything turbocharged as the sound of the turbo is predominant in the prototype. GE AC6000, once again strength is in the start up and shut down sequence, but RPMs seem to be closer to dremel tool's 36000 rpm than diesel's 1050 rpms. C30-7 I don't get to hear many of them so I can't comment, but...? F-3 by far the best sound, but still light years away from where I'd put out a century note extra for it. The alarm bell sound is right on! I truly hope that the snippits on this manufacturers website are not the best these models have to offer. It reminds me of an analog system developed in the 80's called soundtronics. Never heard of it, strange? I thought the Geep sound on Auren's Trainz program was pretty good, it's too bad manufacturers seem to be heading in a different direction.