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 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.