Might be old news but I just found and read this article posted feb 2021 with the progress of the upgrade. Thought I would post and share.
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Sparty1225, thank you. An interesting article.
Dan Weinhold
Interestingly, the article says that the trailing truck wheels were sent to Lyons Industries in Ebensburg, PA, which just happens to be my home town. I had no idea there was such a business there but I must have passed it 1000 times on the highway just outside the borough limits. Crazy!
Good move!
We did this to the 765 a few years ago. It eliminates a source of problems and servicing difficulties. We didn’t have to do the pony truck, however. It already had roller bearings from the original Lima build.
So do the 1225 or the 765 have roller bearings on the driver axles?
Ed
@Ed Mullan posted:So do the 1225 or the 765 have roller bearings on the driver axles?
Ed
Yes.
Was 765 upgraded because NS wouldn't really allow it to run on their tracks after the long rebuild without being converted to roller bearings? Most class 1's started to ban plain friction bearings around 1994. They are too much of a headache and they can hot box and no class 1 wants an excursion train to be forced to stop for a hot box on a busy main line.
@Robert K posted:Was 765 upgraded because NS wouldn't really allow it to run on their tracks after the long rebuild without being converted to roller bearings? Most class 1's started to ban plain friction bearings around 1994. They are too much of a headache and they can hot box and no class 1 wants an excursion train to be forced to stop for a hot box on a busy main line.
As far as I know 4449 does not have roller bearings on the drive axles. All other axles were changed to roller bearings several years ago however.
@Lou1985 posted:As far as I know 4449 does not have roller bearings on the drive axles.
Correct. However, there is a bearing temperature monitor on each crown bearing, with a read-out indicator in the cab, directly in front of the Engineer's position.
All other axles were changed to roller bearings several years ago however.
Correct again, including the tender and auxiliary tender axles.
@Robert K posted:Was 765 upgraded because NS wouldn't really allow it to run on their tracks after the long rebuild without being converted to roller bearings?
No, that had nothing to do with it.
@Hot Water posted:
Genuine question-what’s the difference between grease and friction bearings?
@GenesisFan99 posted:Genuine question-what’s the difference between grease and friction bearings?
ALL bearing are "friction" bearings. The proper term for a non-roller bearing is a "plain" bearing.
The question doesn't make sense because you are asking about two non-related things. There are roller bearings that use grease, while other types use oil. There are plain bearings that use grease, and others that use oil.
You have to believe. (Is not the 1225 the engine POLAR EXPRESS is based?)£
