Choosing the right drawing

[EVGEN]

I am building a 3D model of the Y3a locomotive. Suddenly, I was faced with the difficulty of choosing the right drawing. This is slowing down creating a model.

In the NWHS archive there are drawings marked “STYLE”. However, until now no one could clearly answer me, what does this mean? Are these variations of a locomotive with certain technical solutions? Or something different?

For example, there are drawings:

http://www.nwhs.org/archivesdb/detail.php?ID=25501
http://www.nwhs.org/archivesdb/detail.php?ID=27475
and
http://www.nwhs.org/archivesdb/detail.php?ID=25822
http://www.nwhs.org/archivesdb/detail.php?ID=24525

or

http://www.nwhs.org/archivesdb/detail.php?ID=49146
and
http://www.nwhs.org/archivesdb/detail.php?ID=21747

For example, drawing # G27138 has two versions:

http://www.nwhs.org/archivesdb/detail.php?ID=90297
and
http://www.nwhs.org/archivesdb/detail.php?ID=27600

On the latest version of the drawing, the parts are shown with the mark "STYLE 1", however the assembly drawing does not have such mark. In general, I got confused with these "STYLES".

Or, drawings:

http://www.nwhs.org/archivesdb/detail.php?ID=53066
and
http://www.nwhs.org/archivesdb/detail.php?ID=61257

Initially, the drawing wore the mark "STYLE", but in the future this mark disappeared. The detail became standard for all classes?

Help to understand this situation.

[RET]

Hi Evgen,

I can't say I'm right, but in many of the drawings you are showing, the drawing was originally done in the 1920's but was revised in the 1950's.

After seeing the drawings you are referencing, I would guess that the revision was necessary to cover a redesign of the supplied part that was done by the manufacturer, or even by a change instituted by Norfolk and Western for some reason.

I would also guess that where the word "Style" is used, there likely was more than one version used concurrently, either because it was required by the different classes of locomotive, or (more likely) it was because the update was progressive and took several years to be completed as the change was progressively applied throughout the different classes. If this interpretation is correct, it would also account for the fact that eventually the word "Style" disappeared from the drawing.

Can anyone else add any more information, either for or against? Because of these differences, it looks as though you are also going to have to decide if you are going to build the 1920's version or the 1950's version of the locomotive.

For those of you who aren't familiar with Evgen's project, he is making drawings for a 15" gauge Norfolk & Western "Y' series articulated: a very ambitious undertaking.

Evgen, I hope that this helps a bit, even although at first it may seem even more confusing.

Richard Trounce.

[EVGEN]

Hi, Richard

The main problem is the lack of specification. The specification is the main drawing document. Unfortunately, this document does not exist.

I would also guess that where the word "Style" is used, there likely was more than one version used concurrently, either because it was required by the different classes of locomotive, or (more likely) it was because the update was progressive and took several years to be completed as the change was progressively applied throughout the different classes. If this interpretation is correct, it would also account for the fact that eventually the word "Style" disappeared from the drawing.

In this matter, I'm in complete agreement with you, Richard. It can be assumed that the new parts received the designation "style". In the future, when the part became standard, this tag was removed.

Because of these differences, it looks as though you are also going to have to decide if you are going to build the 1920's version or the 1950's version of the locomotive.

It will be the locomotive at the sunset of his career (1950's version of the locomotive). Even more, it will be one of the locomotives having numbers 2062-2079. The design of which is significantly different from the original design, what is especially noticeable on the front engine (one huge casting instead of several small ones).

[Jerry_H]

EVGEN,

My take on "style" is this. To use the example of the front engine made up of several castings vs one that is one casting. The connection between device "A" and the frame might have to be different depending on which type of frame you have and one would be a "style 1" and the other would be a "style 2".

Clear as mud? !!!

Jerry

[EVGEN]

Hi, Jerry

Well, then, there's a question you need to answer. I need a bracket (Reverse Shaft Bearing LP Engine Baker Valve Gear). There are two drawings:
http://www.nwhs.org/archivesdb/detail.php?ID=55951
and
http://www.nwhs.org/archivesdb/detail.php?ID=53066
http://www.nwhs.org/archivesdb/detail.php?ID=61257 (early)

There is also one assembly drawing in which different brackets are selected depending on the revision date:

http://www.nwhs.org/archivesdb/detail.php?ID=90297 (early)
http://www.nwhs.org/archivesdb/detail.php?ID=55951
and
http://www.nwhs.org/archivesdb/detail.php?ID=27600
http://www.nwhs.org/archivesdb/detail.php?ID=53066

Which bracket should I choose?