Have you ever bought an “accompanied child” ticket at the train station? If you have, then props to you – if not, it’s a hack worth knowing about as a parent.

One mum tweeted about her genius discovery after learning it is far cheaper than buying a regular child’s ticket – and could make days out with the kids more affordable.

If a child is over the age of five they will generally need their own child ticket. But Sarah Burns, from Manchester, discovered she could buy a £2.85 ticket for just 80p by buying it as an “accompanied child” ticket.

“Today I had to buy train tickets on train as tkt machine at station not working. Guard told me I could have an accompanied child ticket for D. Reducing cost from £2.85 to 80p. Why have I never been told this before and how do I buy this from machine?,” she tweeted on Tuesday.

Burns was travelling on Northern trains – but these types of tickets are available from other major providers, too, so it’s worth checking before you travel.

Trainline offers a ticket for children accompanied with an adult travelling at off-peak times on train services operated by Southern and Thameslink, too.

It also offers a child’s London travel card, covering zones 1-6 for just £2.

Sarah Burns added: “If I can buy this regularly I’ll use the train much more often.”

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This article originally appeared on HuffPost.