If you really must you can run the hose under the rails just after the level crossing. All kinds of cables are already installed like this. You may need two or three people shoving the ballast with shovels to fit a big hose like that but it should work.
If you find out, please report back!
I assumed that this was the doing of a rookie or someone having a laugh.
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It’s hilarious that they knew about the pic, lol
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If you really must you can run the hose under the rails just after the level crossing. All kinds of cables are already installed like this. You may need two or three people shoving the ballast with shovels to fit a big hose like that but it should work.