行き (yuki) "bound" should probably be some kind of preposition?

[fcbond]

次　の　ケンブリッジ　行き　電車　は　いつ　です　か？

Literally:
next-ADN Cambridge bound train -TOP when COP Q?

I think the best semantics is for 行き bound to be relational ~ bound(train, Cambridge), currently it is a noun compound. Note that we can also say:
次　の　ケンブリッジ　行き　の　電車　は　いつ　です　か？

Google has this three time more often with 'no' than without it.