C2C will lay on extra trains if a 48-hour tube strike in London goes ahead as planned.
The rail firm said it feared the London Underground strike, planned to start at 9pm tonight [Monday] and finish at 9pm on Wednesday would affect some of its passengers.
A spokesman said: "To provide more capacity to deal with the anticipated extra demand, we are running additional trains."
Four trains an hour will run from Laindon to Fenchurch Street between 10am and 2.30pm.
And four trains an hour will run from Fenchurch Street to Laindon between 1pm and 3pm.
A spokesman added: "These trains will add over 6,500 seats each day for passengers travelling in the London area. We already operate every carriage available on c2c’s peak-time services."
The firm also added that its trains can only stop at West Ham Station when Transport for London are able to open it.
In the event this is not possible once the strike has begun, c2c services will not be able to call at West Ham.
A spokesman said: "c2c customers using West Ham should prepare alternative routes in case, but c2c trains will stop at West Ham as long as the station is open."