Toy railway (5,3)

I think it could be either:

Which length description are you looking for?:

5,3

train set

'toy railway' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for train set that I've seen before include "model railway" , "Strange treats in store for this model toy" , "Number of tracked items" , "A child might play with this" , "Layout with engines" .)

I've seen this clue in The Guardian and the Sydney Morning Herald.

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