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I was at Steamtown today and was talking to one of the guys in the shop. I asked him if he knew what the "%" meant on the side of the engine by the road number. He didn't know as anyone he asked didn't know. Any idea?IMG_20180901_145653909

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Dave NYC Hudson PRR K4 posted:

I was at Steamtown today and was talking to one of the guys in the shop. I asked him if he knew what the "%" meant on the side of the engine by the road number. He didn't know as anyone he asked didn't know. Any idea?IMG_20180901_145653909

I found this explanation on this Website

/ Haulage Rating

 

This column lists the class' driving wheel diameter and Haulage Rating. This is a term used on the CNR to denote a locomotive's tractive effort as a percent. Each 1% of Haulage Rating equals 1,000 Lbs of tractive effort. Tractive Effort, is the force exerted by a steam locomotive at the point where the driving wheel contacts the rail, and the following calculation is used to determine the tractive effort for steam locomotives:

 

D� x S x 0.85P
W

= Tractive Effort Lbs

Variable "D" is the cylinder size in inches, while "S" is the stroke in inches and "P" is the boiler pressure in P.S.I. For a locomotive like 6167, the formula works out to:

 

25.5� x 30 x 0.85 x 250
73

= 56,785 Lbs

Which, when rounded up, is the locomotive's haulage rating (57,000 Lbs = 57%)

 

Last edited by Nick Chillianis
Kelly Anderson posted:

Engine89

Before.

CN89

After.

I have always maintained that the 26% on #89's cab is because she looks 26% as good in her CN scheme, compared to how she looked in the Strasburg RR freelance scheme.

Agreed! The Strasburg scheme with the repositioned headlight looks much better. And now the purist C.N. fans will now commence the  snowball and beer bottle throwing!

Last edited by prrhorseshoecurve

The % on the cab sides of Canadian National, Central Vermont, Grand Trunk (of Maine) and Grand Trunk Western steam locomotives was the % of 100,000 lbs of tractive effort that the particular locomotive had. For Example, CNR and GTW  4-8-4 locomotives had 57% on the cab sides......57,000 lbs of tractive effort.

No Canadian National or subsidiary company steam locomotive exceeded 100,000 lbs TE. That included the ex Boston & Albany USRA heavy 2-10-2's acquired in later years by CN, or Central Vermont 2-10-4's.

Last edited by mark s
prrhorseshoecurve posted:
Kelly Anderson posted:

Engine89

Before.

CN89

After.

I have always maintained that the 26% on #89's cab is because she looks 26% as good in her CN scheme, compared to how she looked in the Strasburg RR freelance scheme.

Agreed! The Strasburg scheme with the repositioned headlight looks much better. And now the purist C.N. fans will now commence the  snowball and beer bottle throwing!

Take off hosers!

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