Reply to "How exactly do auxiliary water cars for steam engines work?"

@colorado hirailer posted:

Slightly off topic but l wonder what railroads in the steam era  used auxiliary tenders, in addition to the two cited above ?

First, the "two cited above" are ONLY related to excursion service, i.e. NOT in the "steam era" (neither the SP nor the UP used auxiliary tenders).

R.  Grande, C&S, D&SL,? C&O?

The railroads most famous for using auxiliary water tenders, back in the steam era, were: N&W, IC, and B&O.