In message , at 11:28:14 on Sun, 28
Sep 2014, tim..... remarked:
Why do you think this particular stretch of line will pay its
operating costs from revenue, when the system taken as a whole doesn't?

[Tube fares are about £1.6BN, operating costs about £2.4BN, capital
costs on top of that].

How does that answer my question?

It shows that the margin cost of operating the line could well be of
the same order of magnitude as the farebox.

The point is that the increase in revenue is (somewhat obviously) not
just the fares for the route.

They are income from additional passengers to other station who
otherwise would have driven.

How do you know they aren't included. Actually, at £500k/week extra
revenue I suspect they must be, that's an awful lot of short trips.

It's not normal to attribute per route income against fixed costs this way.

In this case the operating surplus is being used to pay for the capital
costs (which are being paid up front by the council, not TfL).

--
Roland Perry