My family has been in the area for rather longer than 45 years. During that time I cannot say that we can, between us, recall very much enthusiasm of the railway companies, BR et al for serving the South Coast from Redhill.
For many years (probably from electrification - I haven't the time to check) there were four London to Brighton trains per hour. Until the TT changes of 1978 these comprised the fast (running via the Quarry), two slows (one from LB & one from Vic) calling at all stations from Purley to Brighton including Redhill and the semi-fast which typically left Vic at xx28 and called, after Croydon at Redhill, Gatwick, Haywards Heath and Brighton. Until some date in the sixties (?) it also called at Preston Park. From 1978 the semi-fast became a Quarry Line service and the half-hourly slows ran non-stop between Redhill and Gatwick en route to Brighton. Whether there was enthusiasm from management I have no idea.
Having a connection between Redhill, Earlswood and thus the South of the BML has just been something that has had to be done to avoid rerouting journeys unnecessarily. The coastal expresses have very much always favoured the Quarry and these, funnily enough, are also the services most suited to serving other mainline services such as Gatwick.
Yes that's true. Coastal expresses would be less expresses if they took the slow route via Redhill and even even less if they called there and, funnily enough, by not stopping at Redhill they are better suited to serving the London-Gatwick demand. If Redhill-Earlswood were closed it would be a very great inconvenience to those travelling to Gatwick and beyond from stations south of Purley (or accessing Redhill for the south from west or east) so it does avoid rerouting journeys unnecessarily.
During the many proposed changes and cuts to lines and services over the course of time, I stand by my comment that I am surprised that this was never proposed as a BML simplification. The lines through Coulsdon South, Merstham and Redhill hold little value and limited daytime capacity for express services, but have provided and continue to provide a good service for local traffic between London, Coulsdon, the Redhill area, Reigate and so on. Added to this, the Slow Lines' service at Earlswood and Salfords has long been fairly limited and especially so at weekends, when you would think that leisure services would be provided if so required.
Map 9 of The Reshaping of British Railways (commonly referred to as the Beeching Report) indicates that all stopping passenger trains would be withdrawn from the Redhill-Guildford and Redhill-Tonbridge sections and closure of stations other than Reigate on these sections. I see no evidence that Redhill-Earlswood was under threat. So you can add Dr B to the list of people who could see no logic in removing a section of limb from the anatomy of the BML.
In my opinion a half-hourly service stopping at Salfords etc. is comfortably adequate to deal with the traffic offering. What would you regard as adequate?
A significant bulk of the traffic is from Redhill anyway; added to the other towns, villages and suburbs, the actual capacity on the Slows from Stoats Nest would, in the event of service cuts, have been well-suited to being distributed amongst trains to Redhill and its unique ex-SER route connections.
I have explained that, it the event of cuts, the "unique ex-SER route connections" would have been well up the list to be cut themselves. I agree that much of the slow line traffic is to/from Redhill but the capacity on the slows must be of the order of 10-15tph. This is vastly in excess of that of which a town of 18,000 souls can make sensible use.
On the other hand, the rise of Gatwick and the evolution of the cross-country services I alluded to before have both meant that closing such lines would be patently stupid. This, I believe, has been the reason why there has been a commercial desire to keep these lines open. In addition, co-ordinating and marshalling troop trains and suchlike meant that Redhill was a useful "crossroads" facility at other times, so even a vague notion of lifting the lines was probably deemed a bad thing immediately either side of or during WWII.
Indeed it would be patently stupid. Then why did you post at (#94) "I am actually surprised that nobody has ever seriously proposed closure of the route between Redhill and Earlswood, with the BML permanently diverted via the Quarry Line only."
I fear you may be getting confused with what railway companies have had to do to avoid being seen to get away with stupid errors, and what they would probably have liked to do on several occasions, but weren't able to because they would have been seen as just too short-sighted for strategic reasons. I genuinely think that simplifying the Redhill area to being two suburban branches from London is exactly the sort of thing which would have been attractive had there not been some hope provided by routes being connected up at exactly the right point by way of the course of history.
I am not getting confused. The closure of the Redhill-Earlswood section would have been at any point in the last 116 years (since the opening of the Quarry Line) and remains today and will remain for many years to come, barring nuclear war, a crack-pot idea of the first order. What any company does (railway companies included) to avoid being seen to get away with stupid errors is not to make stupid errors in the first place. And I cannot see what "stupid error" you are accusing the LBSC, the Southern Railway, British Rail, Connex, Southern or GTR as having made other than NOT closing a section of line and thereby cutting Redhill off from the south.
The point of the Quarry Line was to finally rid the Victoria-Brighton and South Coast route of the necessity to trundle through Kent area infrastructure at Redhill, serve it or care about it. Whilst the company history is rather more complex, the "coastal" idea of avoiding Redhill has and remains still prevalent in deciding service priorities in the area years later. And if Gatwick and the South could have been served adequately via the Quarry without needing a service from Redhill, which as I stress is the reason why Redhill-Earlswood is needed, I think simplification would have occurred.
It is not true that the LBSC pulled out of serving Redhill when the Quarry Line opened. The SER opened its London-Sevenoaks-Tonbridge line in 1868 after which the importance of the SER Redhill route was much reduced. The Quarry Line was built to relieve the Redhill line in the face of growing traffic levels - an alternative might have been to more obviously quadruple the existing alignment but, I presume, that this would have been more expensive and disruptive to the town of Redhill and cut straight through the junctions which would, by this time, have been busy with freight if not passenger traffic. Redhill was very much a beneficiary of the Quarry Line.
I suspect that Gatwick and the South could, even today, be served perfectly well without use of the Redhill route (other than at times of disruption) but Redhill is a significant town en route and it would be silly not to provide an integrated service. Mainline trains are now at such a frequency that robust timetabling requires that once separated into Redhill and Quarry services at Stoats Nest there is an absolute minimum of the trains subsequently sharing tracks. I can only say that I find this logical.
So, then, what is my overall point? That timetables and infrastructure still reflect the fact that the Kentish company/operator was the only one which really ever wanted to serve Redhill, and that Southern and Thameslink, like their predecessors, never wanted to and have never found it to be worthwhile or practical to run services since they have been able to avoid the area. A large part of the original issue with this is that there was great rivalry and bickering for a considerable time about the stations in Redhill, and who should be allowed to the serve the area. The fact that Redhill ever retained a connection to the South is a quirk of history. This is reflected by how much easier it is to run services from Redhill to Tonbridge or Reading than it is to serve the Coast.
As I have explained the SER pretty much left Redhill once it had a better route into Kent via Sevenoaks whilst the Southern Region stopped three out of four Brighton trains per hour at Redhill for the 45 years from electrification onwards and two per hour for some years after that. If there are only trains southbound to Gatwick Airport, Three Bridges or Horsham nowadays that reflects the growth from six trains an hour through the Haywards Heath area in 1970 to ten trains an hour (12tph from HH to Keymer Junction) in 2016 (disputes permitting!). Reintegrating services from the down slow lines back into the down fast lines with 10tph coming the other way on the up fast just isn't on. To say that the LBSC and successors have never been interested in Redhill is unprovable and flies in the face of the evidence. In 1973 down off-peak departures from Redhill were as follows: xx00 Brighton; xx23 Brighton; xx36 Bognor (via Horsham & Littlehampton); xx53 Brighton. And, as today, Eastbourne and Worthing would have been a single change away.