The station "receiving the delivery" drops in demand and recovers:
 
	one primary station and one secondary station
 
	if deliver to primary station ->
 
	5 demand initially Jan 2029
 
	drops to 4 demand one month later Feb 2029
 
	2 demand after 6 pax car delivery in Mar 2029
 
	Recuperates to 4 in Apr 2031
 
	Recuperates to 5 in Dec 2031
 
	 
 
	if deliver to secondary station ->
 
	4 demand initially Jan 2029 (starts at a lower demand)
 
	stays at 4 demand one month later Feb 2029
 
	2 demand after 6 pax car delivery in Mar 2029
 
	Recuperates to 4 in Apr 2031 (I didn't catch the exact month)
 
	Recuperates to 5 in Dec 2031 (I didn't catch the exact month)
 
	 
 
	Both stations operate the same as far as I could tell. There was no noticeable difference between demand dropping in the primary and secondary stations.  Am I answering your question?
 
	caveat: (it's possible if it's covering a city of 7, one station might slightly faster recover because the game might split the houses to be 4 at the primary station and 3 at the secondary, but I don't have motivation to be that precise).