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D A Stocks[_2_] · November 7th 14, 11:57 AM posted to uk.transport.london

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In article

rg, (Recliner) wrote:

wrote:
In article ,
(Richard) wrote:

I suppose the other question is in which direction? Are they
switching at different locations Northbound and Southbound?

Yes, I wondered about that, but from my observations, it's the same both
ways (ie, City Thameslink).

I wonder why some trains change at Farringdon then?

I thought it was panto up at CTK and down at ZFD, the idea being that it's
easier to reverse or (at CTK) dispose of a train to the sidings in the event
of problems with the changeover. I don't think any of the crossovers or
sidings at/adjacent to CTK are wired, which will influence the decision.
There are times when CTK is closed so I imagine it's easier to do the
changeover at ZFD.

--
DAS