The RMT Union has confirmed that cleaners on the East Coast Mainline and the Tyne & Wear Metro are striking for 48 hours.
The cleaners are in dispute with their contractors over their pay and conditions.
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There are 66 candidates standing in the Tyne and Wear area in the General Election on June 8
Richard Vincent, 32, of Southmead Avenue in Blakelaw, was last seen in Newcastle city centre near to Spital Tounges.
There are 32 candidates standing in the Tees Valley area for the 2017 General Election