What's the meaning of the underlined?

[Eartha]

Dear all,

What's the meaning of the underlined?
Thanks in advance.

...Perhaps you can imagine what it meant when, one fine day, fortune smiled on Grandfather. He got himself in a trainwreck[FONT=&#23435]！[/FONT]
Now, if something like that happened to you (and you survived) you had it made. The railroad would pay! So all of the lucky passengers knew exactly what to do; they commenced to groan piteously and writhe upon the ground while waiting for the doctors and stretcher bearers to arrive.

 

[AndrewTheElephant]

Guess it's the same as "you did it" or "you managed to do it".

 

[Ouisch]

"You had it made" = you're on Easy Street, you're riding the gravy train, you're rolling in clover.

All are slang terms that mean you have achieved financial security, you'll never have to worry about money again. :-D