@bob.s - I don't think so. I'll check with a rail-industry friend about that, however...Maybe it is done in regions with more moisture in the air than we have in the central US.
@Vasily.Semin - Yes the 100-400 range is quite useful. I have one of those, too, but am just having fun with a new toy for a bit I do love the compression, especially with our miles of boring straight track.