[tz] Another change on Brazilian DST time

[Lester Caine]

On 15/10/2018 12:59, Clive D.W. Feather wrote:
> Should we have a zone for these trains? What would we call it?

Since one has to have the position to know what offset to use it's 
simply a geoposition problem which the next RFC should certainly address?

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Lester Caine - G8HFL
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