"mmellor" wrote

Coulsdon North was always off the fast (Quarry) line

Agreed.

- the 1980s
changes didn't alter tracks in that area. What they did do was
rationalise the arrangements between S. Croydon & Windmill
Bridge/Gloucester Rd.

So what route (i.e. which right-hand crossovers) did fast services (in both
directions) take between the Quarry lines and the former "through" platforms
(4 & 5?) at East Croydon? I had assumed the move was made at Stoats Nest,
but if it was actually at South Croydon, then I concede that you're right.

I thought Coulsdon N closed because Smitham (next door) could perform
its functions very adequately.

I agree that they used that reason to justify the closure - the Smitham
terminators date from that time, I think.