(CNN) -- Two commuter trains collided head-on Monday evening in western Switzerland, injuring dozens, officials said. 
 
 One locomotive's driver was missing after the crash, police said, and search crews were trying to pry open the train's crushed cab. 
 
 At least 40 people were injured, including five seriously, Swiss Federal Railways spokesman Reto Schaerli told CNN. 
 
 The collision happened in the village of Granges-pr├Ęs-Marnand, about 8 km (5 miles) south of Payerne, around 6:45 p.m. 
 
 Rescue teams at the scene included paramedics, firefighters, police and an air rescue helicopter, police said. 
 
 Authorities are investigating what caused the crash. 
 
 "At the moment, we don't have any ... information how this collision happened," Schaerli said. 
 
 The trains were on a route between Payerne and Lausanne, a city on the shores of Lake Geneva, Schaerli said. 
 
 The crash will interrupt train service between Payerne and Moudon -- a city near the line's halfway point -- until at least midnight, Schaerli said. 
 
 CNN's Stefan Simons contributed to this report. ||||| Swiss television, citing local police, reports that 44 people have been injured, four of them seriously, in a head-on train collision in the west of the country. 
 
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 Police inspect the site where two passenger trains collided head-on in Granges-pres-Marnand, western Switzerland, Monday, July 29, 2013. Numerous people have been injured. (AP Photo/Keystone, Laurent... (Associated Press) 
 
 A police officer inspects the site where two passenger trains collided head-on in Granges-pres-Marnand, western Switzerland, Monday, July 29, 2013. Numerous people have been injured. (AP Photo/Keystone,... (Associated Press) 
 
 Public TV station SRF quotes Vaud canton (state) police spokesman Pierre-Olivier Gaudard as saying one person has yet to be recovered from the wreckage. 
 
 The crash happened late Monday on a regional line about 50 kilometers (31 miles) southwest of the capital, Bern. 
 
 Pictures on the website of local daily 24 Heures showed the two regional trains locked together but still on the tracks. 
 
 Earlier this month, 79 people were killed in a high-speed derailment in Spain.
– It has been a bad month to be a train commuter: Canada, France, Spain, and now ... Switzerland, where two commuter trains collided head-on today, injuring 44, four seriously, reports CNN. Local TV says one person is yet to be recovered from the wreckage, the AP reports. The crash happened between the cities of Moudon and Payerne. "We don't know why this crash happened," says a Swiss Federal Railways spokesman, per CNN. "There is currently no train service between these two cities until midnight tonight at least."