Hi Gary.
What an awful lot of misunderstanding and misconceptions.
The facts are as follows.
We can connect two identical 24V transformers in four ways.
(1) Primaries in parallel.
(a) Secondaries in series.
Output = 48V, current same as one secondary winding's capacity.
(b) Secondaries in parallel.
Output = 24V, current capacity double that of one secondary winding.
(2) Primaries in series.
(a) Secondaries in series.
Output = 24V, current capacity same as that of one secondary.
(b) Secondaries in parallel.
Output = 12V, current capacity twice that of one secondary.