I remember about 15 years ago.....before the days of adsl....i wanted two 56k dialup connections to my house....so paid BT somewhere about £115 to install a new line. BT blokey turned up and installed a 'gizmo' so the two lines would share the same copper wire. I went nuts at BT when i discovered if you tried to bring up 2 data connections at the same time, you got a very poor connection speed. Apparently it was ok for a voice call and data call at the same time but not two data calls.....BT were back a few days laters running another bit of copper to the telegraph pole 
Wasn't a box marked up 'Subscribers Unit WB900, Adapter No.1A' by any chance?
Ah, the good old WB900. Lightning strike in an area normally knocked them all out. I used to carry loads on the van, thus always got the jobs to change them. Quite often used to change 10+ a day after a strike.
Got a job one day, a farm, all 3 of their lines were NDT/TOK (No Dial Tone, Line Test Passed), walked into their cupboard where the woman pointed me towards, all 3 lines were the carrier halves, poor cow

DACS was a vast improvement, but high speed modems were getting popular by this time, so wasn't the answer.
Obviously, with ADSL (and the demise of fax), most have dropped down to 1 line, meaning plenty of lines in the ground now
