I ask because I wasn't. From satellite maps it appears to me that not all tracks of Gare du Nord are in the hall, only 16 - but maybe what I see east of the old hall is built over the extension of the eight other tracks? But for Leipzig, it's certain all tracks are under the halls. (There are a number of stations that have more tracks than Leipzig only with not all tracks covered. For example, Munich [32 tracks + 2 underground], or Paris Gare de l'Est [30 tracks]. But in meters, Leipzig Hbf's width beats the latter, too.)

_{*Lunatic*, n.
One whose delusions are out of fashion.}