This is the engine:

http://www.hoseeker.net/assemblyexplosionbachmann/bachmann484northerndiagram1990.jpg

Are there other models that use the Northern 4-8-4 wheelset? You know, so I can cast a wider net.

I have a Northern 4-8-4 (Burlington) from the 70s/80s. It's shown here:

http://www.ho-scaletrains.net/bachmannhoscalelocomotives/id44.html

I need to replace the drive wheels, side rods and cylinder frame assembly.

Any sources for parts other than eBay? If I send it in, will Bachmann honor their lifetime guarantee?

The gear from NorthWest Short Line is performing admirably. Thanks to all those who offered assistance here.

I ordered a gear that should fit from NorthWest Short Line.

I'll share the results when I get the gear in the mail.

Thank you for your help. The model I'm working on was called the "Flying Scot" and it is in fact a 4-6-0.



From the looks of it, it does seem like the link you reference would fit. Any idea who might sell that chassis?

Thanks--will do 

Anyone know what the usual turnaround for the NWSL folks might be? I submitted my search form but haven't heard back.

I shall. Thanks.

Here are two photos of the gear:

https://drive.google.com/open?id=0By5JSs8ll4FMUFdLTHlFU3lJNmsyZDhZRTVRc2NFTVRjYlBZ

https://drive.google.com/open?id=0By5JSs8ll4FMa0NNd1FybUgyYndMc1R2Y1BWdTd5azBULTJv

Hello,

I'm looking to replace the axle gear for a late '80s Bachmann Flying Scot 4-6-0. The Bachmann parts office is not able to help.

Here's the gear info:

Gear OUTSIDE DIAMETER (tooth tip to tooth tip):  12.5 mm
Gear INSIDE DIAMETER (bore hole or shaft size): 2 mm
Gear WIDTH: 9.5 mm
24 teeth
Straight teeth
Plastic

The axle part of the gear is 9.5 mm wide while the gear itself is 1.25 mm wide.

Thanks in advance for your help.