In message , at 02:10:19 on Sat, 25 Mar
2017, John Levine remarked:
Thanks. I wonder why they have head and tail lights?
Yes, I wondered that. Perhaps for the benefit of (rare) track workers?
Probably because the same equipment runs outside in other places. The
Dallas-Fort Worth system is elevated,
I'm pretty sure the original one was like a roller-coaster, at or below
ground level (see below) and diving under the roads. Only four terminals
then.
https://upload.wikimedia.org/wikiped...t_guide_map200
2.jpg
--
Roland Perry