यमला-पगला-ट्रेन का-दिवाना - कार्तिक

It is said that Mumbai-Jaipur and Mumbai-Indore Duronto trains have RSA.
It is fact that Mumbai-Jaipur Duronto, though is run just twice a week but can not operate without second rake.
Yet, I find that the description boards on both the trains do not indicate RSA and hard marked with either Jaipur or Indore (with train numbers).
In this situation, the RSA is...
more...

possible when
* either the Boards are replaced weekly to give correct indication of the service
* or the rakes are run with wrong descriptions.
I may not be seeing the correct side of this case. May some member, please put more light on this issue!
Thanks!