Really the only options are.
Water jetting/sandite train used during leafall (we are not at that point so can't be that)
De-icing train (we are not at that point so can't be that)
Weed killing train (coming up to that point if not already)
Rail grinder (might carry some water but not a water train)
High Output Ballast Cleaner (doesn't carry any water but perhaps someone is mislead by the "cleaner" bit?)
Water jetting/sandite train used during leafall (we are not at that point so can't be that)
De-icing train (we are not at that point so can't be that)
Weed killing train (coming up to that point if not already)
Rail grinder (might carry some water but not a water train)
High Output Ballast Cleaner (doesn't carry any water but perhaps someone is mislead by the "cleaner" bit?)