Arriva Trains Northern

The Rail, Maritime and Transport Union (RMT) has called for two 48-hour strikes on 24 and 25 January and 5 and 6 February.

It will affect inter-city routes across the Pennines, regional railways across the north and north-west of England.

The RMT says the action is being taken in a bid to reduce the pay gap between guards and drivers.

South West Trains

Walk-outs at the end of last week and Monday and Tuesday of this week caused chaos for commuters across the south of England and London.

Only 400 of the usual 1,700 SWT services ran on Tuesday.

A third 48-hour strike has been called for 24 and 25 January.

The dispute is over pay.

The company has offered staff a 7.6% pay increase over 18 months which has been rejected.

There is another stumbling block over the downgrading of RMT activist Greg Tucker from a train driver to a ticket collector.

SWT said this followed safety-related incidents and it offered an independent reassessment of Mr Tucker this December.

Scotrail

Drivers have been staging an unofficial overtime ban since the end of December.

Only 75% of trains are running across Scotland.

The company has offered staff a 3% pay increase but the drivers want 22%.

Connex South Eastern

No strike action yet but trouble is brewing.

Members of the RMT union heavily rejected a pay offer in a referendum and it is now seeking further talks with management.

They would have to hold another ballot before any industrial action could be taken.

The company operates trains into London from south-east England.

London Underground

Tube drivers are due to meet next month to decide what action to take in a pay row.

The drivers' union Aslef has accused London Underground of going back on a deal last autumn which stopped strikes by thousands of workers.

Workers were given a 4% pay increase but Aslef wanted a further payment to close the gap between the wages of Tube drivers and staff who drive engineering trains at night.