Steam

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All,

The N&W Class A above 30 mph has roughly the same Drawbar Horse Power as 1.6
SD70M-2 over the rest of the speed range.  If anyone is interested.

John Rhodes


On Wed, May 28, 2008 at 6:33 PM, NW Mailing List <nw-mailing-list at nwhs.org>
wrote:


>

> > Figure three SD45s can haul a 7500 ton train at 51 mph, then. How fast

> could three 4300 hp SD70s haul it? This is not quite 20% more power than the

> SD45s. It takes 50% more to haul it 62 mph. So only 20% more would fall far

> short of 60 mph.

>

>

>

> You're forgetting that SD70s have a higher TE curve... thanks to radial

> trucks (bolsterless HTCR II vs Flexicoil) and more sophisticated traction

> motors (D90TR vs D77) and alternator (AR20/CA7 vs AR10/A7)

>

> Robb Fisher

> RFDI

>

>

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