NSW families are being urged to "mind the gap" over the school holiday period with new figures showing almost 200 kids have been injured over the past 12 months on Sydney's rail network. 

The most common incident involves children falling in the gap between the train and the platform, followed by accidents involving Opal barriers and incidents of kids slipping, tripping or falling around train stations.

Horrifying footage released by Sydney Trains shows a small child falling through the gap at Sydenham Station in February this year, while another video shows a child trip while exiting a train at St James station in April.

One of the more alarming videos shows a small boy fall down several stairs while rushing through St Leonards Station in March.

Sydney Trains Chief Executive Howard Collins said that incidents are most common at some of the busiest stations on the network, with over half occurring across Town Hall, Circular Quay, and Central stations.

"The most important message I'd like to share with parents is please don't rush around stations or platforms - we now have more trains services than ever before, so the next train is only a few minutes away," he said.

"Station staff are on hand to help at Sydney Trains stations and are only too happy to help you and your family as you move around the concourses and platforms."

Transport Minister Andrew Constance said that while school holidays were "naturally an exciting time", it's also a time when the number of accidents on the network "dramatically increases".

"Regrettably, a lot of those incidents were preventable and one child injured on the network is one too many," he said.

"As a parent I know how hard it can be to juggle travel with young children, but a simple thing such as holding your child's hand when moving around stations and boarding a train can help prevent them from being seriously injured or worse."