A little reminder from them would be good, cause I had forgotten that.
That was also the ep in which Supergirl decided not to use her super speed in order to beat Cadmus...
As for Red Supergirl, I just assumed she was in the current time frame. And I wonder what they have her doing? I would assume that the avalanche in the beginning that threatened the train was caused by Red Kara's pummeling a tunnel underground. My question is why though..? It can't be for a secret tunnel, as seismic sensors all over the world would register the impacts, much less Supergirl being able to hear it as well. If it is for a secret tunnel, it would have been better to have her burning a tunnel through the ground with her heat vision.