Raliegh - with internal cable routing?

[fiveSixteenths]

Evening all. Can anyone shed any light on this?
Steel framed, large but quite light, blessed with a lovely Dulux paint job and these mystery (to me anyway) openings in the underside of the top tube, one at each end.
They look like they might be some kind of cable routing, but I can't find a Raleigh that would have had that - or something to do with the brazing at the factory?
Frame numbers are just on the BB (two sets) and nowhere else on the frame (as far as I can see).
Any ideas?

 

[james_from_stoke]

That looks like a very similar frame to my raleigh pioneer. that is indeed top tube cable routing

 

[fiveSixteenths]

Re:

Ah, that's encouraging - will check that out.
Cheers for the help!

 

[marshalllucky]

Looks like a Raleigh Mtrax road bike I had years ago especially the 3/4 bridge behind the bb shell , never understood that ??

 

[fiveSixteenths]

Cheers marshalllucky. That was puzzling me as well. Seems utterly pointless really.
So these are touring or racing frames in the usual hi-tensile steel?