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Re: Technical Discussion About Axle Journal Bearings

Posted by Train Dude on Sat Oct 11 22:20:27 2008, in response to Re: Technical Discussion About Axle Journal Bearings, posted by SelkirkTMO on Sat Oct 11 21:34:41 2008.

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According to a Timken Rep., from a mechanical standpoint, there is no benefit to either inboard or outboard. I took issue with this issue but from a maintenance point of view. Inboard bearings cannot be visually inspected during a 'walk-around'. Hot journals may be harder to detect with inboard bearings as was the case in the NJT derailment a few years ago. As to replacing wheels, the bearing is not "ruined" when removed from the axle. Once the 3 end-cap bolts are removed, the journal bearing will slide off the axle with only the seals needing replacement.

I don't know of any finding that deemed inboard bearings unsuitable for NYCT use. What I was primarily interested in is why Metro-North and LIRR made the switch. Will NJT, based on their recent unfortunate incident, also switch?

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