The two trains were traveling on a single track in Bavaria, each going around a bend at about 62 mph so they were not visible to the engineers. The trains were equipped with automatic braking systems reported to have been deactivated.
"Media reports said human error was to blame for the high-speed crash near the southern spa town of Bad Aibling, where one of the trains sliced into the other, ripping a hole in its side," writes Ralf Isermann for Agence France‑Presse (AFP). They crashed at 7 am on Feb. 9.
One media source "said a signalling station worker had manually disactivated [sic] the automatic signalling system to let the first train -- which was running late -- go past." Another source "said manually disabling the signalling would have disactivated the automatic braking systems."
After German rail was liberalised at the end of the 1990s, BOB became one of the train operators competing with state-run Deutsche Bahn.
Although it has lost its monopoly operating status, Deutsche Bahn still owns the rail network.
More will be known about the cause, whether human error or a technical malfunction is to blame, after the trains' black boxes have been analyzed. Two of the three have been recovered. Both engineers and two conductors were among the fatalities.
Police chief for the Upper Bavaria region, Robert Kopp, said the trains were carrying about 150 passengers, fewer than on a regular work day as many people were off for the region's winter holidays.
The crash "rais(es) new questions about the safety and reliability of a rail network in Europe that has been the envy of much of the world," writes Melissa Eddy for The New York Times. But "crashes across Europe in recent years have highlighted weaknesses in the rail network."
Many countries in the region have abandoned government-run monopolies in favor of privately-run rail systems, even as the European Union is spending billions of euros to modernize rail networks.
The result is an increasingly precarious system, with a patchwork of old and new technologies in use at the same time, and with drivers, who are often alone in cars, shouldering more responsibility for safety.
In Germany, the most serious accident since unification was in 1998, when 101 people died in the northern town of Eschede after a high-speed train derailed, crashing into a bridge. Fatal crashes since then have been rare and on a much smaller scale.
"The accident is believed to be Germany's first fatal train crash since April 2012, when three people were killed and 13 injured in a collision between two regional trains in the western city of Offenbach," writes AFP's Ralf.
In the United States, the National Transportation Safety Board (NTSB) is still investigating the cause of the May 10, 2015 Amtrak Northeast Regional train derailment in Philadelphia that killed eight passengers.
FULL STORY: Ten dead as commuter trains collide in Germany

Trump Administration Could Effectively End Housing Voucher Program
Federal officials are eyeing major cuts to the Section 8 program that helps millions of low-income households pay rent.

Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

Ken Jennings Launches Transit Web Series
The Jeopardy champ wants you to ride public transit.

Texas Bills Could Push More People Into Homelessness
A proposal to speed up the eviction process and a bill that would accelerate enforcement of an existing camping ban could make the state’s homelessness crisis worse, advocates say.

USGS Water Science Centers Targeted for Closure
If their work is suspended, states could lose a valuable resource for monitoring, understanding, and managing water resources.

Driving Equity and Clean Air: California Invests in Greener School Transportation
California has awarded $500 million to fund 1,000 zero-emission school buses and chargers for educational agencies as part of its effort to reduce pollution, improve student health, and accelerate the transition to clean transportation.
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
Heyer Gruel & Associates PA
Ada County Highway District
Institute for Housing and Urban Development Studies (IHS)
City of Grandview
Harvard GSD Executive Education
Toledo-Lucas County Plan Commissions
Salt Lake City
NYU Wagner Graduate School of Public Service