Thats true..I think for the price of the new receivers Aristo should not have missed that.The old receiver in
the C-19 will give you directional  lights and in reverse the head light dims to half
brightness. I also run all my battery powered locos with the head light always on.
When I was at the ECLSTS last weekend I picked up some old receivers at a real
deal..
Ed McConnell

The new revolution steam receivers don't work right in the K-27 and C-19. The decoder positive out to the engine is missing so you don't have motor cooling fan or engine lights. Older style receivers work 100%
in both engines. I gave up on the K-27 chuffer and installed magnets on the rear driver. The C-19 chuff
works much better.
I have been discussing the receiver problem with Navin at Aristo..
Ed McConnell