^I'm sure the cars will have digital signs in place of the roller curtains. You can see one on the front of that 5000 series photo.
You can also familiarize yourself with the marker lights on a approaching train as I have. The top set of 8 lights on the front of each train has a distinct pair of illuminated lights to identify where the train will be terminating on each line. This has been done since the 1940's to let the tower operators know in advance which way to through the switches.
RED LINE
Double Yellow- Howard, Dan Ryan
Red, White- Roosevelt, Wilson
GREEN LINE
Double Yellow- Harlem/Lake, Ashland/63
Double Green- 63rd/Cottage Grove
Green, White- to Loop only
BROWN LINE
Green, Red- Kimball to Loop
Red, Yellow- Belmont
ORANGE LINE
Red, Yellow
PINK LINE
Red, White
YELLOW LINE
Double Red
PURPLE LINE
Double White- Linden to Loop
Yellow, Red- to Howard only
BLUE LINE
Double Yellow- O'Hare, Forest Park
Double White- Jefferson Park, Belmont/Kimball, UIC-Halsted
Double Green- Former runs to 54/Cermak
Run in Express Mode..
Flashing Double White
Extra readings
Double White for out of service and lay ups
Double Green for the CTA logos
For more info on marker lights check out
http://www.chicago-l.org/operations/...s/markers.html