London underground
Three 24-hour strikes are scheduled on the Piccadilly line in March and ApriliStock

Tube unions are planning to strike on the Piccadilly line from 9pm on Wednesday 23 March, in the first of three 24-hour walkouts over a "breakdown in industrial relations" over a range of issues with the "ageing" line.

The RMT union said they had entered discussions with London Underground management to prevent industrial action over the line – used by an average 600,000 passengers a day including those travelling to Heathrow Airport – but talks broke down as a result of "hostile and confrontational attitude" by management.

When is the strike?

There will be no Piccadilly line service from late evening on Wednesday 23 March and all day Thursday 24 March. Transport for London advises to complete journeys on the Piccadilly line by 10.30pm on Wednesday 23 March and to travel earlier if possible.

How do I get to Heathrow?

If you are planning to travel between Heathrow airport and central London during this strike, you can use Heathrow Connect and Heathrow Express to and from London Paddington station.

Which tube stations are affected?

Interchange stations along the Piccadilly line will be busier than usual, particularly Finsbury Park, Green Park and King's Cross, which are expected to be particularly busy during the morning and afternoon peaks.

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Other tube lines will be busy during the industrial actionGetty

Other stations expected to be busier than usual are: Acton Town, Archway, Baron's Court, Earl's Court, Euston, Gloucester Road, Hammersmith, Highbury & Islington, Holborn, Leicester Square, Paddington, Piccadilly Circus, Rayners Lane, Seven Sisters, South Kensington and Victoria.

These other tube lines are expected to be busy too: Central line, Victoria line, Metropolitan line, District line, Circle and Hammersmith & City lines and the Northern line. London Overground and DLR services will run as normal.

Which National Rail stations are affected?

The following National Rail services may be busier than usual: Great Northern, Chiltern Railways, South West Trains, Heathrow Express and Heathrow Connect.

What about buses and coaches?

Victoria Coach Station will be busier than normal but normal services will run. Visit the National Express website for more information. Roads in west and central London are expected to be busier than usual, especially the A4 and M4 to Heathrow. TfL will run more buses on routes expected to be busy.

You can follow @TfLTravelAlerts and @piccadillyline on Twitter for updates during the strike.