Hi,
It could have been an NOSS (Naval Ocean Surveillance System) satellite formation that you saw.
I happened to see a triple formation on several occasions quite a few years ago from a dark sky site...
As quoted on this website
http://www.satobs.org/noss.html
"One of the interesting sights in the night sky are the Naval Ocean Surveillance System (NOSS) satellite formations, each having two or three satellites in close proximity to one another. Normally these satellites are relatively dim to the unaided eye, but on occasion they brighten sufficiently to be easily seen in a dark sky."
Regards, Dean