A 17-year-old girl was sexually assaulted at a train station before she was taken on to a train and raped in the toilet.
The sexual assault happened at Woolwich Arsenal railway station on the platform towards Abbey Wood at 6.05am on Saturday, July 19, police said.
Five minutes later, the girl was raped in the Thameslink train carriage toilet towards Abbey Wood from Woolwich Arsenal.
A man left the train at Abbey Wood while the girl continued towards Slade Green and later reported it to the police .
British Transport Police (BTP) said a 30-year-old man was arrested on suspicion of rape and taken into custody.
He has now been released on bail pending further inquiries.
Police are appealing for anyone who was at Woolwich Arsenal station and may have seen the pair on the platform.
The force is also appealing to anyone who saw them on the train together to contact police on 101.
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