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The National Surface Transportation Safety Board (NTSB) has determined that a fatigued train conductor's failure to properly line a switch is the probable cause for a 2015 collision of two Southwestern Railroad freight trains near Roswell, New Mexico.The engineer of the striking train died, and the conductor was seriously injured in the April 28, 2015, collision that derailed 11 locomotives and three empty hopper cars. The crash caused about $2 million in property damage, according to an NTSB press release.The accident occurred when a westbound Southwestern Railroad train traveled through a switch left in the reverse position at the east end of the Chisum siding, just south of Roswell, and collided with Southwestern Railroad's Roswell Local, which was standing in the siding. The conductor of the standing Roswell Local train told a manager that he failed to line the switch for normal main track movement at the Chisum siding.The striking train crew didn't perceive the misaligned switch in non-signaled territory and failed to stop before reaching it. As a result of its investigation, the NTSB issued one new safety recommendation to the Federal Railroad Administration (FRA) to develop a device or technique that would eliminate the possibility of employees failing to perform critical tasks such as lining a switch, lining a derail or ensuring cars are in the clear."A train is an enormous machine that can injure or kill people, damage property or harm the environment," said NTSB Chairman Robert Sumwalt. "Given the stakes, image and audio recorders belong in train cabs. Yes, they help investigators but they also can help railroads ensure safer operations."The NTSB's report also reiterates three recommendations to the FRA, including requiring the installation of technology to warn trains of incorrectly lined main track switches and two addressing the installation of recorders to capture the actions of the crew.Post-accident toxicological testing for the dispatcher on duty, the conductor and the deceased engineer is detailed in the report, even though impairment is not considered a factor in the accident's probable cause.The dispatcher’s test results were negative for alcohol and drugs. The engineer’s results identified significant levels of tetrahydrocannabinol (THC). These results, and the presence of rolling papers and pipes in the locomotive cab suggest the engineer smoked marijuana between 30 minutes and five hours before the accident, and, because the engineer had been on duty for almost 10 hours, he likely used marijuana while on duty and likely was under its influence while operating the train, the NTSB determined.It could not, however, be determined if the THC in the engineer’s system affected his response to the misaligned switch. The conductor's results were positive for medications administered during his medical care and for oxycodone and its metabolite, oxymorphone. However the results indicate the conductor most likely was not impaired at the time of the accident, NTSB officials said.The lack of inward-facing cameras in the locomotive prevented the NTSB from determining the actions of the crew members while operating the train, or even which crew member was operating the train just prior to the accident. FRA data show the positive rate for post-accident drug testing declined in 2017 to 1.2 percent from 4.2 percent in 2016.