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- Path: sparky!uunet!destroyer!wsu-cs!usenet.ins.cwru.edu!po.CWRU.Edu!elw4
- From: elw4@po.CWRU.Edu (Evan L. Werkema)
- Newsgroups: rec.railroad
- Subject: Re: GE chugging
- Date: 17 Nov 1992 06:06:45 GMT
- Organization: Case Western Reserve University, Cleveland, OH (USA)
- Lines: 51
- Message-ID: <1ea25lINNo7e@usenet.INS.CWRU.Edu>
- References: <01GR8G20IQ7C95NCKV@VAXC.STEVENS-TECH.EDU>
- Reply-To: elw4@po.CWRU.Edu (Evan L. Werkema)
- NNTP-Posting-Host: slc5.ins.cwru.edu
-
-
- In a previous article, U93_PTUPACZE@VAXC.STEVENS-TECH.EDU (Prime Mover Software Development) says:
-
- >Ah, yes, a favorite topic of mine...
- >
- >GE's chugging have long been a part of my railroad memories. I grew up on the
- >Erie Lackawanna Boonton Line, and their freight U33C/U36C's were fairly
- >common. But even better were their U34CH commuter units - their HEP generators
- >were run off the prime mover; hence, they were always running at the
- >equivalent of Run 6 - so you can imagine the sound as they accelerated from a
- >stop! WOW! Today's Susquehanna's DASH 8-40B's still have that familiar GE
- >chug, though I think GE's figured out how to quiet 'em down - you can only
- >hear the Suskie's units when they notch out climbing up Sparta Mountain or on
- >the grade out of Butler. The spirit is still there.
-
- GE came up with an exhaust silencer in 1980 to comply with EPA regulations.
- The "fat" stack on late Dash-7's and Dash-8's is a result. They are much
- quieter than the old stacks...I was surprised to hear how loud a old U36C was
- compared to a C30-7. Amtrak's DASH 8-32BWH's draw HEP off the main generators
- too, but they're still fairly quiet beasts, and FAR quieter than an F40PH.
-
-
- >As for explanations... GE's and Alcos share a common trait: four-cycle
- >engines.
-
- They share more than that...GE's FDL-16 has the same bore, stroke, and RPM
- as the Alco 251. I made some recordings of GBW C424's last summer, and
- was surprised at how similar they sounded to the B23-7's I got on the ATSF.
-
-
- >GM's have a two-cycle engine, which "explodes" its cylinders at a
- >high rate of speed. The four-cycle timing of GE's and Alcos allows a short
- >pause, and a deadening of sound temporarily before the next "explosion." I
- >think this allows the sound to reverbrate better, and makes the next
- >"explosion" seem more loud; hence, the "stalk-chopper" sound.
-
- We liked to call them "cabbage cutters," but now that they've muffled them,
- the discriptor isn't quite so apt.
-
- >Another neat sound I enjoy are turbocharged EMD's - especially the 50/60
- >series. Their turbochargers are slightly more melodic, but they all have that
- >neat high-pitched humming...
-
- I haven't noticed it on any other engine, but DASH 8-40B's seem to have
- a charasteristic whine they emit under load. It makes them easy to pick out
- in recordings.
- --
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- |_II___I____Santa Fe____I_| |_I__Evan Werkema__I__I___I_| I elw4@po.cwru.edu I
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