I think Bill has the solution, that the Os operated in coupled sets. Similar to the problem found in the States where single DMUs sometimes had trouble operating track circuits (rust coating on rails after rain), but not twin sets.

First O slid, but as it did so it cleaned the rails and the second car's brakes were sufficient to prevent the pair taking a dive.

Regards

Dudley Horscroft
----- Original Message -----
From: Bill Bolton
To:TramsDownUnder@...
Sent: Friday, March 30, 2012 9:34 AM
Subject: Re: [TramsDownUnder] Monorail disposal - the Noel Reed solution

On Thu, 29 Mar 2012 20:51:39 +1000, Richard wrote:

> As an aside, I have occasionally wondered why apparently it was
> only corridor cars which took the plunge....

Well, the corridor cars operated far more of the service runs than
than the O class cars in later years when the runaways occurred. So,
statistically they would have had a greater chance of encountering the
exact set of circumstances that might produce a runaway.

The Os also mostly operated in coupled sets when running to Athol, so
that is probably another factor to take into account.

The corridor cars also had self-lapping brakes, which is another
difference from the Os.

Cheers,

Bill

Bill Bolton
Sydney, Australia

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