SD75IW

[AlcoRS11Nut]

I was looking at the Canadian National roster and I saw SD75I's listed and SD75IW's listed what are the differance between the two models? Thanks.

[Anonymous]

I belive that the I designation means it's a "isolated" cab. IE the cab sits on rubber mounts and therefore isolates a lot of the engine noise from the cab. And the I designation supercedes the w designation because a I cab is a W cab with better mounts.

[Anonymous]

^ is accurate.
Our Canadian wide cabs .... ah another proffesional invention by our country.

[Anonymous]

What will those whacky Canucks think up next?

[kenneo]

They, too, have been trying to make the passenger train make a profit.

But they did succeed with a better cab.

[Anonymous]

At one roster the SD75´s are named I and at another IW.
Optical I see no difference between the two models.

Is it possible that the W designates an other aspect than the cab?

[M636C]

Guys,

My (2000) "Canadian Trackside Guide" doesn't indicate any differences in the SD75I class, and this book is fairly good in showing class differences. It's possible that some modifications might have been made to the class since then, of course. Any number of possibilities come to mind, many connected to software upgrades!

Peter

[Anonymous]

Thank you Peter !

You see it in the same way like me.

[Anonymous]

EMD markets the SD75IW as their "Whisper Cab", isolated, wide body cab designed to reduce fatigue to crews. Neat info at http://www.gmemd.com/en/locomotive/innovations/whisper/index.htm

Jeff

[Anonymous]

Dosnen't BNSF have some of them

DOGGY

[hogger42]

QUOTE: Originally posted by Doggy

Dosnen't BNSF have some of them

DOGGY

Yes, BNSF has them and they make a big difference, nice and quiet.[:D]

[Anonymous]

QUOTE: Originally posted by hogger42

QUOTE: Originally posted by Doggy

Dosnen't BNSF have some of them

DOGGY

Yes, BNSF has them and they make a big difference, nice and quiet.[:D]

And the "W" indicate what ? No, not the whisper cab.

This feature is indicated with an "I" (Isolated) and often - SD70MAC and SD90MAC - GM makes no difference between the normal Widecab and the wide Whisper cab.

With logic "IW" couldn´t stand for the Whispercab because the "I" alone in a GM designation stands also for the Whispercab.

And the SD70´s with the wispercab are designated SD70I, not SD70IW!!!!

[Anonymous]

QUOTE: Originally posted by hogger42

QUOTE: Originally posted by Doggy

Dosnen't BNSF have some of them

DOGGY

Yes, BNSF has them and they make a big difference, nice and quiet.[:D]

And the "W" indicate what ??????????????

The whisper cab is indicated with the "I" = Isolated

[hogger42]

QUOTE: Originally posted by bigboy4015

QUOTE: Originally posted by hogger42

QUOTE: Originally posted by Doggy

Dosnen't BNSF have some of them

DOGGY

Yes, BNSF has them and they make a big difference, nice and quiet.[:D]

And the "W" indicate what ??????????????

The whisper cab is indicated with the "I" = Isolated

Wide Cab as stated earlier in this thread.

[Anonymous]

Hi Hogger 42

CN´s SD70I have the same widecab / whispercab and are not indicated IW !!!!

[M636C]

Ulrich,

You aren't going to win this one, and I still don't know why some SD70I might have a "W".

Peter

[Anonymous]

[^][:)][;)]

Peter,

I know, I know!!

They will not see that W isn´t widecab!!!

BTW: One fact that nobody see: The "W" is the GE letter for the widecab (AC4400CW) - EMD use the "M" (SD70MAC !!!

[BentnoseWillie]

"IW" is not an EMD term or a CN one.

EMD called the CN units SD75I's - I for the WhisperCab version of teh EMD widecab design (usually designated by an M). I think the WhisperCab equipment has since been incorporated into all EMD widecabs, and is no longer distinguished by the "I".

The only other term CN would use is their road class, GF-643a for the first order, GF-643b for second order, etc.

EMD have not built, nor has CN ordered, a "W" option locomotive (CN-spec 4-window cab, standard-width long hood) since the last order of SD40-2W's in the early eighties. GE denotes its widecab option with a "W".

[UPTRAIN]

Yes the canadians came up with the safety cab but wasn't Conrail the first to order Isolated "Whisper Cabs"? I think they were on SD60I's The only ones built.

[espeefoamer]

Why do builders still use W to designate a widecab unit,since all units built now are widecabs?Shouldn't the designation be dropped?

[UPTRAIN]

So in the computer they can distinguish if the unit has or dosen't have a wide cab.

[M636C]

But Guys,

This doesn't explain why a roster would show some SD75I locomotives with a "W" since all have the same cab, unless it applies to some non-cab feature.

BW has pointed out that EMD (or at least GMD) used W to indicate the CN design cab on SD40-2s and other units, but this wouldn't apply to some SD75Is and not to others.

Maybe it's just a typing error!

Peter

[UPTRAIN]

The I cab is on rubber mounts while the M is welded to the frame, therefore the I cab is quieter and has less vibration The I cab has a seam on the nose where it is seperate from the sand boxes. Hope this helps [:D][:D][:D][:)][:)][:)][8D][8D][8D][:p][:p][:p][;)][;)][;)]