"With 200 miles of bad track you could pick just about any place."

In 1925 there were 33.6 miles of track on six lines.

Several miles of track were under construction by late 1889.

Today, only three lines and 17 miles of track remain.

The combined systems had over 200 miles of track, with almost 100 in the city.

Two new lines are being added to the original 15, along with another 192 miles of track.

It began operating in 1845 with 12 miles of track.

The new line was initially expected to cost $506 million and cover 5.6 miles of track.

Service began on December 1, 1855 with 13.2 miles of track.

But the question remained: how many other places along the system's 722 miles of track had the same problem?