Were you at Waterloo International on 14 November 1994?

The archives containing the official photography from the first day of service were lost in a flood so Eurostar is now asking people to come forward with their own photographs and stories as it prepares to move its London terminus from Waterloo to St Pancras on 14 November.

Eurostar has created an online portal for people to upload their stories and photographs. For those chosen to be featured on the site, there will be the chance to win return tickets to Paris, Brussels or Lille from the new St Pancras International terminal.

“As well as looking forward to St Pancras, we also want to celebrate our first thirteen years at Waterloo and those first historic journeys between London and Paris in 1994," says Simon Montague, director of communications at Eurostar.

"The day we began operations was hugely important to us and our travellers, so the loss of our photographic archive was very sad. However, we are confident that our original customers can help us build up a new record of that unique day and we look forward to seeing the photos and stories that we know are out there."

If you have pictures or a story from Eurostar's first day that you would like to share, visit www.eurostar.com/fortomorrow. Submit your entries before 14 October for your chance to win a pair of standard class return tickets to Paris, Brussels or Lille.

Entries may also be submitted by post to Catherine Sharp, Eurostar House, Waterloo Station, London SE1 8SE.

• The international platforms are likely to be used for domestic rail services once Eurostar ceases to serve Waterloo.