Answers: If the 'London Extension' still existed then Network Rail would own a useful fourth nouns between the Capital, the Midlands and the North with several expresses a time each bearing and an intensive local and suburban service, both of which Marylebone had formerly the line be truncated north of Aylesbury.
More than that, however, they would have have a ready-made line built to a standard dexterous of taking Continental trains from across the Channel, because by 1899 when the London Extension was built, trial bores for the Channel Tunnel have already begun and the Directors foresaw a time when cross-Channel trains from the Tunnel would be a realness.
By the time plans were within hand for the present Channel Tunnel however, the GCR Main Line have been be closed, just one subject of the 'Beeching Axe'.
Very few I would guess, as Chiltern Railways runs a very intensive service on both the Met/GC Joint and on the GW/GC Joint. Of course, seeing as how they enjoy extended services on the latter to Birmingham and beyond, they might have run services to Rugby/Leicester/Nottingham on the former have it still existed...we can but dream and think what might hold been...
Later: The answer mentioning terminal size is interesting. Chiltern Trains have have to extend Marylebone just to cope next to its existing services.
Very difficult to answer this question.
With modern signalling, respectively track can accomodate a train every ninety seconds, which is 40 trains per hour.
But line-capacity is solely part of the problem. Each stop made by a train reduce line dimensions, and, even the most intense service can rarely realize more than 30 trains per hour.
But capacity is noticeably reduced when it comes to terminals. If the terminal have just two platforms, it almost impossible to realize 20 trains per hour. But whereas additional platforms increase the terminal-capacity, the additonal weave movements at the approach junctions reduce the line-capacity.
Not simple.
Sorry
An interesting question beside no easy answer. The queue would have be more easily adapted to 125MPH running later the West Coast Main Line, which has have a lot of money to get done this. The London Extension was much better enginered afterwards the WCML with smaller number curves, howether Marlebone station is not the best placed station in London for comuteing as with the sole purpose 1 tube line conects to it. Marlebone station be also never built with as masses platforms as were envisaged by the lines planners, the spare park has immediately been sold of to developers. What the London Extension would be usefull for is provideing extra fraight train routes as the WCML is commonly said to be approaching full capacity
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