Importing Alignment

Good Afternoon,

I'm trying to import/use an alignment file that I've received, the alignment is in .dgn format and is a series of line strings along each rail. The alignment received is exactly the one I want to use in my model to then use a corridor and then use the strings as the point controls. I'll attach an image so you can better see what I mean. 

The red blue and white are the line strings, what is the best way to go about doing this without losing the accuracy/position of the alignment?

Thankyou!

Jake Slight smile