A kitten, thought to be around four weeks old, is being looked after by the Blue Cross charity after being found on Monday on an Underground train. The cat, who has been named Victoria, had to be cleaned up because she was covered in a sticky substance.
She will now be transferred to the charity's rehoming centre in Oxfordshire.
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The inaugural service left London Liverpool Street for Shenfield, Essex, on the existing TfL Rail route on Thursday morning.