Erm,Railcraft waypoints
if you mean Minimap Waypoints
go to %appdata%
find the .techniclauncher
find tekkit
mods
reis_minimap (folder not zip)
(yourip).bla bla bla
Copy and Upload
and tell them where to put it.
if your ip changed
Replace (IPNumberHere).bla bla bla
with (Newipnumberhere).bla bla bla