1. Why does Line 10 split at Mirabeau?
Back in the 1890's, after several decades of political struggle with national rail companies and the national government, the Paris City Council eventually succeeded to enforce its vision for the construction of an urban rail system exclusively dedicated to serve the city. Among the Paris City Council requirements, it was specified that no point in the city should be at more than 500 meters from a metro station. However the territory of the city wasn't entirely built up at the time. The point was indeed precisely to stimulate real estate construction.
That was still a problem for the engineers who were designing the network. As a solution, they decided to end 2 lines with big loops: one in the North-East which is today served by
and the other in the South-West which is today served by
.
A lot later in the late 1970's, the area of Boulogne-Billancourt became very dense so it's been decided to expand
westbound to serve it. And that's how the loop became the current split.
2.When was the Anthony-Orly shuttle built?
Orlyval was built in 1991. Serving Orly airport became critical in the 1980's. The first idea was to build the current
, then to connect it to Villejuif branch of
and to expand it to Orly airport. However that was judged too costly and would took too many times to get built. That's the reason why it's been decided to go for a quicker alternative in building an automatic shuttle connecting the Airport to the nearby
.
30 years later,
will eventually be expanded to Orly Airport, however with a brand new infrastructure and not in using the
branch. The project is currently under construction and targetting a delivery by 2024 for the Olympics.
3. What is the advantage of tire vs rail?
The tire technology was designed in the 1950's. It allows faster accelerations and brakings, which is pretty useful in a network such as the Paris metro where stations are very close to one another and, as such, where stops are very frequent. Furthermore, tires are less noisy and more comfortable.
However, tyred-wheel trains use more energy and aren't optimal at full speed. As such, the technology becomes less advantageous when average distance between stations reaches 1 km. More recently, tyred-wheel trains have been denounced because of their high rate of micro-particle emissions. Systems to limit those are currently being designed.
4. What is the average top speed on the Metro?
Average speed and top speed are different things.
The average commercial speed varies from 21 kph on
(which has the most frequent stops) to 39 kph on
(which has the least frequent stops).
Top speed on most lines is of 70 kph. It reaches 80 kph on
. On the 4 new lines which are currently under construction,
, the top speed should be of 120 kph.
It's worth being noted though that Paris is also served by the RER network which has more of a "mass-transit" use than "pure" suburban rail networks such as those of London and NYC. Top speed on RER lines varies between 90kph and 120kph and commercial speed is much faster as well. Annual ridership on the 5 RER lines is of 1.1 billion per year so that's something which is hardly negligible.