Have been getting alot of requests for this from colleagues at work, hope it may help a few others out there based in the rail industry.
There are two attachments,
Network Rail access points - Coverage - UK, a full list of access points as detailed by Network Rail, works by searching for the ELR first.
All credit goes to Network Rail as the developer of this poi, just a pity they don't keep it updated, it's also available for download via tomtom home.
Scotlands Rail Structures -Coverage - Scotland only, a list of Network Rail owned structures i.e. bridges, culverts & tunnels, works by searching the three digit route number & a three digit structure number, e.g. route 1 & structure 1 would be searched as 001/001.
These co-ordinates must have been established years ago as this attachment is only a couple of years old & alot of the structures are not exact, but for those who have searched all day for a culvert on the railway it certainly gets you in the ball park, DO NOT rely on this poi to get you exactly to a structure, it is suitable only for guidance.
Unsure who gets the credit for converting the structure list into the tomtom attachment.