Here are the answers to the riddles:
I'm the head of the line, the first to go,Answer: A locomotive
All others do follow the track I lead.
All the work is mine, for the others don't show,
The will to move without my deed.
They see me as a blight, for I cover the light -Answer: Rain
I'm welcomed and hated wherever I go.
I can stop the game, which for some is a shame,
Yet at least I help the field to grow.
Some wish me away, some wish that I'd stay -
I like it best when the pressure is low.
Though it's not my main to entertain,
I sometimes come with my own light show.
I'm sure there are some people who are getting too much of it at this time. It would be nice if you could send some of your surplus here.