Conductors on Southern Rail have voted "massively" in favour of three 24-hour strikes over the coming month.
Rail union RMT announced on Tuesday that conductors will stage the three protests on April 26, May 10 and May 12 in a row over their roles and driver-only trains.
The union's core demands include rejecting the extension of Driver Only Operations, scrapping the introduction of an on-board supervisor role, and rejecting conductor redundancies.
A collision between two trains at Plymouth station today was a "sober reminder" of the importance of rail safety.
Manuel Cortes, leader of the Transport Salaried Staffs Association, made the comments after 18 people were injured in the crash at platform six this afternoon.
"Our first thoughts are of course with those hurt in this accident", he said.
"It is far too early to speculate why today's crash happened and an investigation into its causes will now take place.
"However, it is a sober reminder of how critical safety is for our industry and thanks to the efforts of our hardworking and dedicated staff unfortunate incidents like this sad one are actually so rare".
The number of injured in a "low-speed" collision between two trains at Plymouth Station has risen to 18.
Ambulance services described some of the casualties - which include the driver of one train - as "walking wounded".
A spokeswoman for South West Ambulance Service said: "The majority of those are walking wounded and eight of those are going to Derriford hospital in Plymouth."
Devon and Somerset fire service said they had assisted ambulance crews and the British Transport Police in treating casualties with "various injuries", but no one had been trapped
Nine people were injured after two trains collided at a railway platform in Plymouth.
No-one is believed to be trapped following the incident, which happened on platform six at Plymouth railway station.
Four fire engines attended the incident which is described as "on-going", according to Devon and Somerset Fire and Rescue Service.
Dominic Parnell, 33, said the train he was travelling on collided with one in front.
"We were travelling fairly slowly as we were arriving at the platform when we came to a sudden stop with a huge bang," he said.
"Of course, most people were stood up waiting to alight and were thrown forward.
"No one appeared to be injured in my immediate area".
South West Ambulance Service said they were treating a "number of walking wounded".
Two people were killed when a passenger train derailed in Philadelphia on Sunday.
US rail service Amtrak said the train, en route from New York to Savannah, Georgia, struck a digger, causing the lead engine to come off the tracks.
In addition to the fatalities, more than 30 of the 341 passengers were treated for injuries.
The Northeast Corridor between New York and Philadelphia is currently suspended.
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