Young people have until the end of January to submit their designs as part of the Railway 200 celebrations.
The competitions, run by LNER and the National Railway Museum, offer “money-can’t-buy” prizes.
Children up to age 11 are invited to design future railway uniforms for existing and potential new roles.
The winner will see their design made-to-measure by LNER’s uniform supplier, Dimensions, and will also receive first-class LNER tickets for their family.
For those aged 12 to 17, the challenge is to visualise a future train, including interior and exterior design, and practical considerations for construction.
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The winner will enjoy an exclusive experience with LNER’s Azuma trains, including a journey in a driver’s cab, a visit to the driving simulator, and first-class LNER tickets for their family.
Entrants are encouraged to consider how the railway and the world will change over the next 200 years, and to showcase how their designs can meet the needs of LNER’s customers, people, places on the route, and the planet.
Linda Wain, engineering director at LNER, said: “At LNER we are always looking towards the future, exploring how our trains can be more sustainable and how we can continually improve journeys for our customers.
“This competition is a great opportunity to see how young people see rail evolving.
“We’re excited to see some brilliant designs and interesting ideas and we may even discover some future rail engineers in the making.”
Andrew McLean, assistant director and head curator of the National Railway Museum, said: “The National Railway Museum is not only engaged in recording and showcasing our rich railway history, but we also aim to inspire the next generation of innovators and engineers.
“We look forward to seeing the creative designs and ideas that this competition generates as we look forward to the next 200 years of the railways.”
The competition closes at the end of January when a panel of judges from LNER and the National Railway Museum will choose the winners.