Final answer:
The individual known as London's 'Railway Murderer' and 'The Man With the Laser Eyes' is a fictional character from literature, specifically from the Sherlock Holmes stories by Arthur Conan Doyle. This character is the arch-nemesis of Sherlock Holmes and is portrayed as a criminal mastermind.
Step-by-step explanation:
The individual known as London's 'Railway Murderer' and 'The Man With the Laser Eyes' is not a historical figure, but rather a fictional character from literature. The description you provided matches the character of Professor James Moriarty, who is the arch-nemesis of Sherlock Holmes in Arthur Conan Doyle's detective stories. While Moriarty is not specifically referred to by these nicknames in the original stories, he is portrayed as a criminal mastermind and a formidable adversary for Holmes.