Question: How to export a numerical solution of dsolve properly.

I'm working on several worksheets where I solve numerical DE's. I would like to compare the solutions by plotting in one graph So I though it would be nice to have a seperate worksheet for this.

My approach:

Statements from my original sheets:
> solution:=dsolve({ODES,ICS},maxfun=0,numeric,range=0..10,output=listprocedure):
> X__br:=eval(xbr(t),solution):

I can plot these variables in my original sheet with plot(X__br(t),t=0..10).
However, when I transfer it to a different sheet by:

> save X__br, "filename.mpl"

And then load it into a new sheet by
> read("D:/.../filename.mpl");

There seems to be no possible way to plot the X__br(t) anymore. How can I solve this?
My error when I try plot(X__br(t),t=0..10) is:

Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct