score:5
You are incorrect, cars are not numbered 1-8 and 11-18, they are numbered 1-8 or 11-18.
From the webpage you link to:
coach 1 to 8 or coach 11 to 18.
On any given trip, the cars will be either 1-8 or 11-18. For the purposes of selecting a seat 1 and 11 are then the same as are 2 and 12 etc.
As for the two numbers, it seems to have to do with the direction of travel. The diagrams are not going to be an exact representation of the carriages (as they have multiple rolling stock, that do vary). But seat number XX in carriage Y should be of a certain type (e.g. window seat versus isle etc.)
Upvote:3
carriages are numbered as follows: coach 1 to 8 or coach 11 to 18
Note that's "or", not "and" - TGVs are sometimes joined together in pairs (not on the Lyria routes, but the trains are the same trains) and then one train is 1-8 and the other is 11-18.
So yes, 1 and 11 are the same, etc.
I can't explain the two different numbers.