Question

Active voice of the first railway as built by george

Answer 1

I think so you mean to say, "Active voice of the first railway IS built by George." Aren't You???

• Passive voice: The first railway is built by George.

• Active voice: George builds the first railway.

And i think it should not be  "The first railway is built by George." and it should be "The first railway was built by George."

Anyway, this is the answer which you are looking for.