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.
More Nation & World Headlines
FDA approves ‘pink Viagra’ drug for women 4:32 p.m. Airbus A321 hits runway lights in N. Carolina Security boosted in Thai capital after deadly bombing; footage shows possible suspect Woman believed to be nation’s oldest veteran dies at age 110 Seagulls have learned a new trick - eating the eyeballs of baby seals IRS: Computer breach bigger than first thought; 334K victims Imperfect test fuels alternative treatments for Lyme disease US: Up to 305 Clinton emails might have classified data
Our new comment system is not supported in IE 7. Please upgrade your browser here.