This is one awesome cam. It is located in Tokyo, in the Gotenyama neighborhood in the Shinagawa ward area. The railroad you see is one of Tokyo's busiest and most important commuter lines, so you'll seldom have to wait more than a minute or so for another train to pop into view.

This is the Yamanoto Line, a circular track which connects the major city centers in Tokyo. It takes about an hour to travel the entire loop. Trains run from 4:30am to about 1:30am. The trains carry 3 1/2 million(!) passengers each day.

Train service is provided by E231-500 series 11-car EMUs first introduced in 2003. These include two 6-door cars in which the bench seats are folded up to provide standing room only during the morning rush hour (until 10 a.m.). All the other cars have four sets of doors on each side. There are two 15" LCD monitors above each door, one of which is used for displaying commercials, news and weather; and another which is used for displaying information on the next stop (in both Japanese and English) along with notification of delays on the Yamanote and other lines.

We have a link to a Google map of this location here

The east side of Shinagawa-ku faces Tokyo Bay and the trade port of Oi Pier which is a wholesale distribution base. The coastal area is an industrial district and the southwest area is a residential district. The Osaki and Shinagawa districts are developing as new business and commercial areas. Nevertheless, since the district had prospered as a post town during the Edo Period, the area is home to many historical places.

These areas were once favored by more established foreign residents of Tokyo. These days, though, it seems that everyone is attracted to these charming residential neighborhoods which offer better housing values and many parks and recreational centers for children. Besides old rail yards adjacent to Shinagawa station, many industrial areas of Gotanda and Osaki are giving way to development of residential and commercial complexes.

Some information on this page came from Wikipedia.