Can I push ? - Propelling ?

[B.Meldon]

Yes.
There are many examples of NG auto coaches used throught the world including some steam examples.

The 1960's designed  H0e/009 Egger-bahn steam railcar was based on one example. However, in that case Egger did not model the rear driving compartment, or even its side access door and it is also about 40mm short as well!

Some lines that used auto coaches turned them at each end, often in a Y or even on a turntable.
The ex-County Donagal railcars on the Isle of Mann only have one slow reverse gear and were turned at the end of the line in Donagal. On the Isle of Mann they were used as a pair back to back with one hauling the other depending on the direction.