Green Means Go, Red Means Slow, Yelow Means Go Fast So What Signal Means Stop

I came across two dangerous safety hazzards both for passengers and crew yesterday.

The first was during the morning rush. I took the 7:38 am train from Burlington and upon arriving at Union there was excess traffic so they pulled our train past the switch and past the red signal in behind another train. I have seen this a lot lately and that combined with conductors always having to reposition the train, it could end up being a collision at Union.
Someone may want to investigate this.

The second is a bit more dangerous. I was on the 5:34 pm train out of Union. When we reached Burlington, specifically signal 393P1, we got stopped on all red. Our conductors did their job and called dispatch and they told them to go manually flip the switch. While the employees were at track level flipping the switch and standing on track 2 to do so, another Go Train rushed by and I heard the conductor scream. He looked and was relieved his co-workers were okay. As I looked up at the signals, I noticed all were red except the yellow light in the top corner. So I guess Yellow means go fast. The danger here near the mall is that this part of the track is extremely dark even if the engineer had put on the front light of the train. But the train that rushed by didn't even use his train whistle all we could hear from him was the clacking of the tracks.
If we don't be careful we are going to have another incident like we did on the ttc where an employee got hit in the tunnel.