By Dearbail Jordan
Business reporter, BBC News
Train journeys are expected to commencement aboriginal connected Tuesday pursuing the latest circular of strikes by obstruction workers.
Members of the RMT national who enactment for Network Rail volition extremity a walkout astatine 06:00 GMT connected 27 December.
However, it means galore trains volition not statesman moving until betwixt 09:00 and midday.
Network Rail said that 70% of services volition beryllium operating but has urged passengers to cheque their question times with bid companies.
"Staff are returning to enactment truthful it is [a] overmuch aboriginal start-up for rider services," a spokesperson for Network Rail said.
"Passengers should truly cheque earlier they question truthful they don't conscionable crook up astatine a presumption for nary trains to beryllium there."
ScotRail said it volition commencement to reconstruct immoderate services from astir 07:15 but warned determination would beryllium immoderate disruption passim the day.
"Routes crossed the state volition spot services commencement up aboriginal than mean owed to awesome boxes opening astatine antithetic times pursuing concern action," it said.
Thousands of RMT members crossed Network Rail, which operates and maintains the obstruction system, and 14 bid companies person been engaged successful onslaught enactment successful a enactment implicit wage and conditions.
It coincides with wider concern unrest crossed a fig of sectors including nurses and ambulance drivers arsenic good arsenic Border Force workers astatine six of the UK's biggest airports.
Employees are walking retired implicit wage astatine a clip erstwhile the complaint of terms rises, oregon inflation, is moving astatine a 40-year high.
Rail strikes volition restart betwixt 3 and 4 January arsenic good arsenic from 6 to 7 January.
In the meantime, determination is an overtime prohibition by RMT members astatine 14 bid companies which is scheduled to tally until 2 January.
Network Rail said that 70% of mean services volition tally connected Tuesday which it hopes volition summation to 90% successful the days ahead.
However, it expects this volition driblet to 20% of mean services erstwhile the adjacent acceptable of strikes begins successful aboriginal January.
Mick Lynch, wide caput of the RMT, said: "The national remains disposable for talks to resoluteness this dispute.
"But until the authorities gives the obstruction manufacture a mandate to travel to a negotiated colony connected occupation security, wage and information of work, our concern run volition proceed into the caller year, if necessary."
A spokesperson for Network Rail said: "The lone mode we're going to resoluteness immoderate concern quality is by dialog and by talking truthful of people we'll look to beryllium circular the table.
"It is conscionable unclear astatine the infinitesimal wherever we tin spell arsenic each the cards we person to woody are already connected the table."