In message
-sept
ember.org, at 08:03:57 on Thu, 28 Apr 2016, Recliner
remarked:

the 73TS were built while the Heathrow extension was
under construction, and a large enough fleet to cover it was ordered.
Without that extension, the order would have been for a significantly
smaller fleet.


They were later modified to have more luggage space by the
doors, with fewer seats.

What was the total cost including the two separate, subsequent extensions
for T4 and T5, the latter also requiring a new grade-separated underground
junction for the T4 and T5 lines to the west of the T123 station? Those
extensions would certainly have much more than doubled the total cost.

And generate double the fares.

Probably not double (have you seen how few people use the T4 station?), but
more certainly.

Latest annual station usage stats:

T123 7.49m
T5 3.90m
T4 2.35m

But if you're going to estimate that total incremental revenue (as you
did), then you also have to look at the total investment.

To simplify things I've only been looking at the cost, and revenue of,
Phase 1, for most of the thread now.
--
Roland Perry