As Southern train drivers and British Airways cabin crew continue to strike, more transport workers are to be balloted for industrial action.

The Rail, Maritime and Transport union announced that maintenance workers on London Underground will vote on a campaign of action over claims of a breakdown in industrial relations and breaches of agreements.

The dispute is separate to the row over job cuts and ticket office closures which led to a strike on Monday, crippling Tube services.

Train drivers on Southern went on strike for a second day yesterday (Tues 10), leading to the cancellation of most of the operator's 2,200 services.

READ MORE: WEATHER: Forecasters report 40 per cent chance of snow for London this week​

A weather warning of snow has been issued for London and people are urged to take extra care.

According to the Met Office, a band of wintry “showers” will pass over the city at the end of this week, and temperatures will drop to four or five °C.

Members of the trade union, Aslef, will strike again this Friday (Jan 13) and again over three days later this month, in a bitter dispute over driver-only trains.

Unite members at BA continued their 48-hour stoppage in a dispute over pay.

The union will hand a letter in at Marks & Spencer's head office calling on the retailer to support its campaign. Unite said the second day of the strike coincides with a roll-out of a new M&S food range on short-haul flights across BA.

Unite national officer Oliver Richardson said: "Cabin crew working for British Airways' 'mixed fleet', 36,000ft up in the air, face earning up to £6,000 less basic pay than M&S staff selling the same food in store."

A BA spokesman said that new cabin crew in their first year working full time at British Airways receive more than £21,000 based on pay, allowances, incentive and bonus.

Mick Cash, RMT general secretary, said of the new dispute on London Underground: "LU management have gone back on agreements over the night Tube and staffing levels and actively attack our reps for carrying out union duties.

"RMT members and the union will not stand by while an intransigent management attempts to ride roughshod over Tube workers.

"That is why we are balloting our fleet staff members for industrial action."

A Transport for London (TfL) spokesman said: "The RMT is balloting for unnecessary strike action, this time involving train maintenance staff, without seeking to resolve these issues with us.

"We urge the RMT to meet with us for talks rather than threatening needless strike action."