What is function of から in conditional statement?


What is the function of から in the beginning of the song by 浅川マキ?

> 夜が明けたら一番早い汽車に乗る **から**
>
> 夜が明けたら一番早い汽車に乗るのよ




Here are the [original lyrics](http://sp.uta-
net.com/search/kashi.php?TID=27185):

> 夜が明けたら一番早い汽車に乗る **から**  
>  切符を用意してちょうだい  
>  私のために一枚でいいからさ  
>  今夜でこの街とはさよならね  
>  わりといい街だったけどね

The から in the first line simply means "because", and the first line works as
the reason for the second line. " **Because** I will ride the first train when
dawn breaks, please arrange a ticket (for me)." or "I will ride the first
train when dawn breaks, **so** please arrange a ticket (for me)."




Here are the [original lyrics](http://sp.uta-
net.com/search/kashi.php?TID=27185):

> 夜が明けたら一番早い汽車に乗る **から**  
>  切符を用意してちょうだい  
>  私のために一枚でいいからさ  
>  今夜でこの街とはさよならね  
>  わりといい街だったけどね

The から in the first line simply means "because", and the first line works as
the reason for the second line. " **Because** I will ride the first train when
dawn breaks, please arrange a ticket (for me)." or "I will ride the first
train when dawn breaks, **so** please arrange a ticket (for me)."

