Dropping your phone, wallet or keys in the mad rush to get off the peak-hour train seems plausible.

Leaving behind your wheelchair, mannequin, or false teeth? Not so much, but it still happens.

Top items found over the past year: Mobile Phones

Mobile Phones Wallets

Wallets Glasses

Glasses Sunglasses

Sunglasses Backpacks

Backpacks Keys

Keys Bicycles

Bicycles Fitbits

Fitbits Kindles

Kindles Umbrellas

Queensland Rail (QR) is holding onto a mixed collection of items lost by customers across the south-east Queensland network.

In the past year more than 18,000 items were handed in or found either on trains or at stations.

The amount of items coming in means the lost property office at Roma Street Station in Brisbane requires three full-time staff members to keep everything in order.

ABC News was given a peek inside to see what train customers were leaving behind.

The collection is impressive - ranging from everyday essentials such as wallets, phones, jumpers, and glasses to the bizarre such as vinyl records, pieces of art, a power saw and crutches.

A sample of the mobile phones currently in QR's possession. ( ABC News: Patrick Williams )

Denise Brotherton, who has worked in the department for seven years, said it was always a good feeling to reunite someone with their lost item.

"It's always nice to give something back when something that might not be very valuable to us is very sentimental to them," Ms Brotherton said.

"They're always extra specially excited when they see it. Whether it be a piece of jewellery or their lunch box."

After seven years working in the lost property department, nothing surprises Denise Brotherton anymore. ( ABC News: Patrick Williams )

Ms Brotherton said wallets were easier to trace back to their owner.

"It's also nice when we can return their money to them ... we've had one just recently a fellow lost a wallet with $800 in.

"It was handed in by an honest customer and returned the same day."

"This is the perfect time to panic, I'm lost." ( ABC News: Patrick Williams )

Uncollected items passed on to charity

Lost items of no great personal value are held for two months before going to QR's charity partners such as the Salvation Army, St Vincent de Paul, DV Connect, The Men's Shed, Guide Dogs and more.

In recent months QR have donated 23 unclaimed bikes to Milpera State High School in Brisbane, which caters for students who are newly arrived immigrants or from a refugee background.

This Batmobile has its wheels, but has lost its owner. ( ABC News: Patrick Williams )

More than 500 pairs of glasses have gone to Lions Recycle for Sight, while two van loads of household items and clothing were given to families starting new lives after experiencing domestic violence. Warm clothing and blankets were also given to the 139 Club to support the homeless.

Enough X-Rays have been lost over the years to warrant their own storage space. ( ABC News: Patrick Williams )

"The most common items to not get collected are mostly clothing and lunch boxes, people think they're just gone forever," Ms Brotherton said.

"People look for glasses and sunglasses because they cost a lot of money.

"Backpacks are generally collected by the end of the two months ... people make the effort to come find it. Sometimes they don't realise they've lost it till they go to use something."

Sentimental items reunited with rightful owners

QR CEO Nick Easy said staff have been part of some special reunions over the course of the year.

"We often have customers enquiring about lost property through social media and we've used Facebook to try and reunite special items," Mr Easy said.

This isn't even half of what QR's currently holding onto. ( ABC News: Patrick Williams )

"As recently as last month, one of our customers, Elyse, contacted us through Facebook, after she had mistakenly left a collection of her artwork at Central Station.

"After working 14-hour days and spending three months to complete them, Elyse was extremely grateful to find that a kind-hearted customer had handed them in, allowing us to safely return them to her."

Someone must wheely be missing this one. ( ABC News: Patrick Williams )

In another rewarding moment, the lost property office was able to return a sentimental 18-carat gold wedding ring to retiree Gerald, who had lost it at Central Station.

"The ring had been passed down to Gerald from his father, from his parents' wedding day in 1930. Gerald had then married his late wife with the ring in 1971, so was understandably very upset when it was missing," Mr Easy said.

Bags take up plenty of space on the shelves in the lost property department. ( ABC News: Patrick Williams )

"He was ecstatic and became quite emotional when one of our lost property officers called him with the good news that the ring had been found.

"Gerald told us he didn't think he had any chance of seeing his ring again and that the Good Samaritan who handed it in had 'restored his faith in humanity'."

If you think you have left something on a train or at a station, log your lost item on the Queensland Rail mobile app, fill out an online lost property form at queenslandrail.com.au, or call Queensland Rail on 13 16 17 Monday to Friday between 7:30am and 5:00pm.