The only thing I can notice is that, in all the other phrases, you must have the first part to have the second part as a consequence. Like, if there is no pain, there is no gain; if there is no rain, there is no grain, etc. But you need to have a vein before you can have blood in it... Am I anywhere close to the answer, or am I sounding foolish???

a little foolish:p.think differently.just similar pronunciation isn't enough.u have missed something!

Things that are wrong:

1) The first word of the sentence is not capitalized.
2) There is no space after the first comma.
3) There are no spaces after the first period, and the third "no" is not capitalized.
4) There is no space after the comma after "rain."
5) There are no spaces after the second period, and the fifth "no" is not capitalized.
6) There is no space after the comma after "lane."
7) There are no spaces after the third period, and the seventh "no" is not capitalized.
8) You do not need a dash after "vein."
9) "there" is not capitalized.
10) There are no spaces after "here."
11) "What" is not capitalized.
12) "Blood" does not rhyme with the first words of the previous pairs.
13) "Vein" does not rhyme with the second word of the previous pairs.

14) The second sentence should read either:
"There is something a little wrong here."
or
"There is something wrong here."

As of now, it does not read correctly.

Also, Caprico technically solved the riddle with his answer.

Hahahahahahahahahaha.... Luv u budunk bro! amazin... :D

its just a riddle.it's not any research material.as i use internet on mobile,i use capital letters less.the comma space factor is also the same.the only thing here i have written wrong is-train doesn't actually run on lane.it runs on rail line.you may argue but that's the answer.