Police investigating the murders of five prostitutes in Suffolk have said they will carry out reconstructions.
Trains were the focus of police enquiries
They will focus on the last sightings of Anneli Alderton, Tania Nicol, Paula Clennell and Annette Nicholls.
Assistant Chief Constable Jacqueline Cheer said: "If we can trace when they were last seen and what they were wearing it will help us.
"We want to work out the time gaps between when they went missing and when their bodies were found."
Investigators also need to go back over hundreds of items of clothing that have been seized and see those that might be relevant but first they need to know what the victims were wearing when they disappeared.
Inquests into the deaths of four victims Tania Nicol, Anneli Alderton, Paula Clennell and Annette Nicholls, expected on Monday, have been postponed, police said.
Last week an inquest was opened and adjourned into the death of Gemma Adams, the fifth victim.
Suffolk Police say a public appeal for help led to thousands of calls, which have provided new leads.
The investigation has included more than 500 officers. Some 350 from 30 other police forces have been involved in the inquiry which has seen detectives trawling through 10,000 hours of CCTV footage.
The naked bodies of the five victims were found dumped in and around Ipswich, sparking a major manhunt.
On Sunday the investigation focused on efforts to retrace the last known movements of Miss Alderton, who police said was last seen wearing jeans, a white top, a black hooded jacket and white shoes.
The 24-year-old is believed to have disappeared after she took a train from Manningtree to Ipswich on 3 December.
Officers spoke to rail passengers on the route taken by the dead woman - from Harwich to Ipswich - in a bid to jog people's memories and create new clues.
Similarly, on Saturday officers stopped and questioned more than 400 motorists and pedestrians in Ipswich's red light area, where Miss Clennell, 24, was last seen on 9 December.
Miss Nicholls, 29, was also last spotted in that area on 5 December.
However, there have been unconfirmed sightings of her in the area after that date.
Some 186 calls have been received in connection with discarded clothing found in and around Ipswich.
Det Ch Supt Stewart Gull said at a press conference on Sunday: "During the last 24 hours we have received a further 1,526 calls from the public offering information.
POLICE PHONE NUMBERS
Suffolk hotline: 0800 096 1011
Crimestoppers: 0800 555 111
"I think that now takes us to somewhere in the region of 10,000 calls - that's a phenomenal response."
Meanwhile, former Home Office minister Fiona Mactaggart has urged ministers to carry out a plan to legalise small brothels. The idea was included in January's prostitution strategy for England, but it has yet to be implemented.
Ms Mactaggart told BBC News the murder of five women in Suffolk showed the need for urgent changes in the law to protect prostitutes.
On Sunday, police revealed that they had arrested a man in connection with an attempted abduction in the weeks leading up to the disappearance of the dead women.