"David Hansen" wrote in message
...
On Fri, 12 Nov 2004 01:12:56 +0000 someone who may be Clive Coleman
wrote this:-
Such an interlock appears to have been common since the 1960s.
Not on the 6300s, 800s,1000s,7000s,9500s,1600s or any steam engine I
ever worked on.
Were any of them designed in the late 1950s or 1960s?
--
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I don't know if it's significant, but I don't believe any of the classes
that Clive notes were designed for multiple (rather than tandem) operation.
Brian