Re: Journal bearing sizes

Randy Hees

Is this narrow gauge?  If so, the D&RG was using a non-MCB collarless axle (called a "Muley") on their standard freight truck.  This bearing has a face to bear on the end of the axle to control thrust.

If standard gauge, the original MCB bearing was 3 3/4 x 7...   This became the MCB A bearing when the B size  (4 1/2x8) was adopted in the mid 1880's, followed by the C (5x9) in the 1890's...

MCB bearings A are very hard to find...  B's and C's are out there... 

Randy Hees

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