This is a screen shot of a free downloadable Excel spreadsheet. One of our the major discussions has been:

*What are the correct replacement part numbers to use in these locomotives?
*What parts are swap-able between locomotives? (focusing on motors, motor saddles, worm/shaft assemblies, bearing blocks, trucks)

To answer that question, I collected the part number information from the Atlas and Intermountain parts websites, and created an downloadable Excel spreadsheet which has drop-down menus allow you to sort part numbers across many the locomotive types, and allows you to answer for yourself :

*By locomotive type, what part number for motor, motor saddle, trucks, etc?

By using the "Sort" drop-down at the top of the Excel spreadsheet, you can quickly find out:

*What parts are swappable between what locomotives?

What became apparent when building this spreadsheet, is there are some notable "exceptions" to what you would expect to be a compatible part. Those are especially worth knowing, as using an incorrectly fitting mechanism part often times leads to a poor running locomotive.

Here is the downloadable Excel spreadsheet, click on the link and download it for free - you are welcome to share it.

https://drive.google.com/open?id=0B5CoS45LdyoKVWVuMWFjaHN0NDQ

Instructions:

You must "Open with Google Sheets", or download it to your Excel on your Windows PC or Mac and then "Enable Editing", in order to see the drop-down menus.

I trust that you'll like this resource. It's a best-effort, I believe it's as accurate as the info that I have; comments and suggested corrections welcome.

You are welcome to share it.... all I ask is that you give me credit as the original author.