The RMT union said about 1,800 members, including train crew and some drivers, are taking action against threatened job cuts and disputes over working conditions and safety.
Virgin Trains East Coast, which operates services between London, eastern England and Scotland, said it was making changes to customer-facing roles.
The company said it would be running a full timetable during the strike but there will be some changes to on-board catering and it may not be able to open the food bar or run a trolley service in standard class, and the first class menu will be reduced.
I think the message is to stock up on food before you travel.
Good morning
Adam Jinkerson
BBC Local Live
Welcome to a brand new week of live updates for Cambridgeshire.
We'll be here until 18:00 this evening keeping you across all the latest news, sport and travel from around the county.A full weather forecast is also on it's way shortly.
I'm sure I wasn't the only person wondering when it got so cold! But it made for some great pictures sent in by our Weather Watchers this morning. Here is a few of the best...
If you want to get in touch today, you can email us, tweet us using the #cmblive or head over to our Facebook page.
Thanks for joining us today and indeed across this week.
We'll be back from Monday morning at 08:00 with regular news, sport, travel and weather updates from around the county.
Let us leave you with this picture of St Ives, sent in by Weather Watcher 'Pensview'.
BBCCopyright: BBC
Have a great weekend.
Littleport road death: 'Incident was clearly avoidable'
Adam Jinkerson
BBC Local Live
Police investigating the death of two men killed in a crash near Littleport, Cambridgeshire, say the incident was "avoidable".
PC James Thorne said: "Mitchell Butler-Eldridge made a conscious decision to overtake a vehicle when it was clearly dangerous to do so and this resulted in the tragic loss of life.
BBCCopyright: BBC
"This incident was clearly avoidable had he thought about his actions and I welcome the sentence passed.
"One bad driving decision and a dangerous manoeuvre has robbed two families of loved ones, and this sentence should serve as a deterrent to people whose standard of driving falls below what we, as society, expect."
Butler-Eldridge, 28, of Sydney Terrace, King's Lynn, Norfolk, was jailed for five years after pleading guilty at Cambridge Crown Court to two counts of causing death by dangerous driving at a previous hearing.
Weather: Dry tonight but turning wet tomorrow
Dan Holley
BBC Look East weather
Isolated showers this evening will fade away to leave much of the night dry with clear spells, and perhaps a few mist patches. Turning chilly with light winds, as temperatures fall to 6C (43F) in prone rural spots.
BBCCopyright: BBC
Sunny spells on Saturday, particularly at first, but an increasing risk of showers or longer spells of rain developing, some heavy with hail and thunder, and perhaps some local flooding.
Feeling notably cool with light and variable winds, and temperatures only reaching 16C (61F).
Get your full local weekend forecast from BBC Weather.
Man jailed for causing double fatal crash
Adam Jinkerson
BBC Local Live
A man who killed two men in a crash near Littleport, Cambridgeshire, has been jailed for five years.
Mitchell Butler-Eldridge was sentenced earlier today at Cambridge Crown Court after pleading guilty to two counts of causing death by dangerous driving at a previous hearing.
The 28-year-old of Sydney Terrace, King's Lynn, Norfolk, was driving his Volkswagen Passat along the A10 Lynn Road on 18 February 2015 when the crash happened.
He attempted an overtaking manoeuvre before a bend and lost control of the car, causing it to collide with an Austin Mini.
The driver of the Mini, Timothy Wildbore, 24, from Victoria Street, Littleport, and his passenger, Andrew Thornewell, 28, from Hollendale Walk, Ely, both died as a result.
BreakingMan jailed for causing double fatal crash
Mitchell Butler-Eldridge, 28, of Sydney Terrace, King's Lynn, who killed two men in a crash near Littleport, Cambridgeshire, has been jailed for five years.
Jail for man who groomed two boys
Tom Horn
BBC Radio Cambridgeshire
A man who groomed two teenage boys has been jailed for four years.
Ricky Loppas, 47, of Chieftain Way, Histon, pleaded guilty to two counts of sexual activity with a boy at Cambridge Crown Court.
The court heard Loppas groomed two 15-year-old victims between September 2014 and January 2015.
He would play computer games with them, take them shopping and buy them gifts. He also gave the boys alcohol and tobacco and invited them to sleep over at his house on multiple occasions.
Loppas admitted abusing his victims while they were staying at his home.
Along with the custodial sentence, he was placed on the Sex Offenders Register and given a Sexual Harm Prevention Order.
Overhead wire damage at Cambridge Station causes delays
Adam Jinkerson
BBC Local Live
Damage to overhead wires at Cambridge Station has caused hours of delays for commuters today.
Engineers started work at 07:00 to repair the snapped line, with many platforms having to shut as a result.
All lines have now reopened, but disruption is due to continue into the evening. Stranded commuters told us their stories...
Live Reporting
Adam Jinkerson
All times stated are UK
PACopyright: PA BBCCopyright: BBC BBCCopyright: BBC BBCCopyright: BBC Cambridgeshire PoliceCopyright: Cambridgeshire Police
Latest PostToday's weather: Mainly dry this morning
Kate Kinsella
BBC Look East weather
It's a chilly start to the new working week and this morning will be mainly dry with sunny spells.
It's due to turn cloudy later and there could be some heavy rain, hail and thunder in the Beds, Herts and Bucks area.
Maximum temperature: 15C (59F).
Virgin Trains East Coast rail staff on strike
Katy Lewis
BBC Local Live
Workers on Virgin Trains East Coast have begun a 24-hour strike this morning in a long-running dispute over jobs.
The RMT union said about 1,800 members, including train crew and some drivers, are taking action against threatened job cuts and disputes over working conditions and safety.
Virgin Trains East Coast, which operates services between London, eastern England and Scotland, said it was making changes to customer-facing roles.
The company said it would be running a full timetable during the strike but there will be some changes to on-board catering and it may not be able to open the food bar or run a trolley service in standard class, and the first class menu will be reduced.
I think the message is to stock up on food before you travel.
Good morning
Adam Jinkerson
BBC Local Live
Welcome to a brand new week of live updates for Cambridgeshire.
We'll be here until 18:00 this evening keeping you across all the latest news, sport and travel from around the county.A full weather forecast is also on it's way shortly.
I'm sure I wasn't the only person wondering when it got so cold! But it made for some great pictures sent in by our Weather Watchers this morning. Here is a few of the best...
If you want to get in touch today, you can email us, tweet us using the #cmblive or head over to our Facebook page.
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BBC Sport
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Read moreSouthend United 1-1 Peterborough United
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Read moreCambridge United 2-1 Accrington Stanley
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Read moreDisabled man finishes his Rio challenge
A disabled man completes his challenge of trying all 34 Paralympic and Olympic sports.
Read moreMan jailed over double fatal crash
A driver who overtook a lorry then crashed head-on into a car, killing two people, is jailed for five years.
Read moreOur live coverage throughout the day
Adam Jinkerson
BBC Local Live
That's all for Friday's updates folks.
Thanks for joining us today and indeed across this week.
We'll be back from Monday morning at 08:00 with regular news, sport, travel and weather updates from around the county.
Let us leave you with this picture of St Ives, sent in by Weather Watcher 'Pensview'.
Have a great weekend.
Littleport road death: 'Incident was clearly avoidable'
Adam Jinkerson
BBC Local Live
Police investigating the death of two men killed in a crash near Littleport, Cambridgeshire, say the incident was "avoidable".
PC James Thorne said: "Mitchell Butler-Eldridge made a conscious decision to overtake a vehicle when it was clearly dangerous to do so and this resulted in the tragic loss of life.
"This incident was clearly avoidable had he thought about his actions and I welcome the sentence passed.
"One bad driving decision and a dangerous manoeuvre has robbed two families of loved ones, and this sentence should serve as a deterrent to people whose standard of driving falls below what we, as society, expect."
Butler-Eldridge, 28, of Sydney Terrace, King's Lynn, Norfolk, was jailed for five years after pleading guilty at Cambridge Crown Court to two counts of causing death by dangerous driving at a previous hearing.
Weather: Dry tonight but turning wet tomorrow
Dan Holley
BBC Look East weather
Isolated showers this evening will fade away to leave much of the night dry with clear spells, and perhaps a few mist patches. Turning chilly with light winds, as temperatures fall to 6C (43F) in prone rural spots.
Sunny spells on Saturday, particularly at first, but an increasing risk of showers or longer spells of rain developing, some heavy with hail and thunder, and perhaps some local flooding.
Feeling notably cool with light and variable winds, and temperatures only reaching 16C (61F).
Get your full local weekend forecast from BBC Weather.
Man jailed for causing double fatal crash
Adam Jinkerson
BBC Local Live
A man who killed two men in a crash near Littleport, Cambridgeshire, has been jailed for five years.
Mitchell Butler-Eldridge was sentenced earlier today at Cambridge Crown Court after pleading guilty to two counts of causing death by dangerous driving at a previous hearing.
The 28-year-old of Sydney Terrace, King's Lynn, Norfolk, was driving his Volkswagen Passat along the A10 Lynn Road on 18 February 2015 when the crash happened.
He attempted an overtaking manoeuvre before a bend and lost control of the car, causing it to collide with an Austin Mini.
The driver of the Mini, Timothy Wildbore, 24, from Victoria Street, Littleport, and his passenger, Andrew Thornewell, 28, from Hollendale Walk, Ely, both died as a result.
BreakingMan jailed for causing double fatal crash
Mitchell Butler-Eldridge, 28, of Sydney Terrace, King's Lynn, who killed two men in a crash near Littleport, Cambridgeshire, has been jailed for five years.
Jail for man who groomed two boys
Tom Horn
BBC Radio Cambridgeshire
A man who groomed two teenage boys has been jailed for four years.
Ricky Loppas, 47, of Chieftain Way, Histon, pleaded guilty to two counts of sexual activity with a boy at Cambridge Crown Court.
The court heard Loppas groomed two 15-year-old victims between September 2014 and January 2015.
He would play computer games with them, take them shopping and buy them gifts. He also gave the boys alcohol and tobacco and invited them to sleep over at his house on multiple occasions.
Loppas admitted abusing his victims while they were staying at his home.
Along with the custodial sentence, he was placed on the Sex Offenders Register and given a Sexual Harm Prevention Order.
Overhead wire damage at Cambridge Station causes delays
Adam Jinkerson
BBC Local Live
Damage to overhead wires at Cambridge Station has caused hours of delays for commuters today.
Engineers started work at 07:00 to repair the snapped line, with many platforms having to shut as a result.
All lines have now reopened, but disruption is due to continue into the evening. Stranded commuters told us their stories...