NorthWest Short Line Atlas F9 wheelsets

The 115 and 145 are the tread width in thousandths of an inch.    115 is pretty narrow.    The old stuff and probably the original Atlas wheels had .172 inch tread width.     I am guessing the 1.405/1.425 is the axle length, and the 1/8 inch is the axle diameter.   

I think the flange depth is the same in either case, unless they list them as "proto-48".    Then they would have an even smaller flange.    The original Atlas F9s had flanges bigger than NMRA standard for 2 rail O scale.   they would bounce on many types of switches.    The NWSL wheels probably have NMRA standard.  

You probably want the 2524 set.   another option would be to ask if you can just get the axle gears separately and replace the ones on your existing axles.

Thanks

I'm measuring a set of wheels and the tread width is approx. 0.145 with a flange width of approx. 0.060 and a flange depth of 0.062.

Not sure how to read the NMRA RP25 spec for tread depth.

I found a Delrin gear that says is for the NWSL wheelsets, calls for a 0.125 bore (assuming axle).  My Atlas axle is 0.159, don't know if that would work or not.  I know you need a tight fit but is 34 thousandths too tight.  Could always ream out, but to what for the 0.159 atlas axle.

As usual, the fix cost more than the locomotive.

THanks

I'll check them out at NWSL.

@prrjim posted:

The 115 and 145 are the tread width in thousandths of an inch.    115 is pretty narrow.    The old stuff and probably the original Atlas wheels had .172 inch tread width.     

You probably want the 2524 set.   

Yes, that's the one. 👍

Mark in Oregon

I know when I asked a question a while back it took NWSL a bit to get back with me, but I got the answer and the order filled with no worries.

@Railthunder posted:

I know when I asked a question a while back it took NWSL a bit to get back with me, but I got the answer and the order filled with no worries.

Yay!

So... how did everything turn out?

Mark in Oregon