Here is a good example of photographic compression. Photo taken by Kevin Andrusia on 1-14-08. This pic has been bouncing around the internet attached to emails (we received it more than once), but maybe you are not on the "right" mailing list. So here it is along with one of the emails.
A mile worth of circus train photographically compressed into a single frame with a telephoto lens (it shows the entire train's consist -- note vehicles already crossing tracks at the grade crossing beyond last car). Kevin Andrusia captured the RINGLING BROS. and BARNUM & BAILEY Circus "RED UNIT" train yesterday (1-14), northbound at Palm Bay, FL (near Melbourne). The 58-car 137th Edition Show (now on the 2nd half of its 2-year tour) is seen on its Miami-to-Columbia, SC (long jump) run via Florida East Coast Railway, en route to interchange with Norfolk Southern in Jacksonville.
The RBB&B BLUE UNIT train was also on a repositioning ('jump') run in FL, yesterday, headed north from Orlando to Jacksonville on CSXT. This year, the BLUE UNIT train is 62 CARS -- 138th Edition Show (now on the 1st half of its 2-year tour).
From the RBB&B Website: "The Red Unit and Blue Unit trains criss-cross the country 11 months out of the year, logging more than 25,000 miles as they bring America's Living National Treasure® to millions of families in more than 90 cities!" http://ringling.com/explore/backstage/town_w_zip.aspx
Here is the Blue Unit back in December, 2000 at Auburndale, FL, also en route from Orlando to Miami at that time: http://www.railpictures.net/viewphoto.php?id=39625&nseq=86