Good Service On The Tube?

One thing I've noticed the past few weeks is that London Underground keep referring to the service as "Good".

I have a feeling that this may be Newspeak for "Normal" as the Victoria line between Oxford Circus and Victoria has been far from good.

The stations regularly close due to overcrowding, and it really is a case of having to hold your breath to squeeze into a packed tube train. All of this while having a jolly announcement informing us all that a "Good Service" is running at present.

I wonder what a "Bad" service is like if this is "Good"?