Answer:
I come with a train and go with a train and the train doesn't need me but can't go without me.
Though I am only two words I have thousands of letters in me
My days are numbered.
Squeeze me and I cry tears as red as my flesh, but my heart is made of stone. What am I?
I may seem real but it always turns out I was never there in the first place... you only see me during a certain resting stage.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.