Yes. If the appropriate equipment is in place then it really is quite difficult to see what the difference is (other than, on average, the London trains will usually be even busier). What do you see as the big problem ?
Interestingly I got first hand experience of being the guard on a train involved in a collision that disabled it recently. We were about 2 miles away from a station just outside a large market town with a large Network Rail Permanent Way depot but in a rural area with poor access.
I had just under 70 people on board, it was really rather hot and despite the fact that thanks to the wonders of modern technology the train's precise location was available to control using GPS it still took getting on for 90 minutes from the point of collision for the first external assistance to arrive.
In that time I found myself firstly having to care for a fairly distressed and inexperienced driver not long out on their own, making sure they'd completed their necessary duties as well as my own, talk down an angry man intent on evacuating the train onto the ballast with or without my consent into the middle of a ruptured fuel tank, care for and contact the parents of a number of unaccompanied minors who were to say the least rather worried, and spend half the time on the phone to control, Network Rail, driver managers, silver command more senior managers and anyone else who wanted my attention until we finally got things sorted.
Then I had to physically help clear the debris from under the train, help the driver conduct brake tests and wheel rotation tests and then accompany him in the cab once the train was patched up until we returned to the nearest station.
On arrival at the unmanned station I then had to go about transferring everyone to a replacement train as the Network Rail staff who had been helping we had left behind to make the line safe for traffic.
This has fixed heavily into my mind that outside the busiest metropolitan areas the support network is not in place and probably won't be to reduce the staffing on trains.
The best bit is that in less than 7 days I was stranded for more than 2 hours no less than 3 times.