SpaceX Starlink 21 Train 2021-03-15 06:06

The Starlink 21 train passing. Watch about a third of the way in from the left. It fades in and because of so many satellites close together and the noise reduction algorithm, it appears as just a line.
SpaceX has been taking measures to make these satellites harder to spot in order to make their impact on astronomy less, but for a few days after they've launched, they're in a different configuration and so can be seen easier. Compare this pass with one of my earlier train videos and you can clearly see the difference.