Here's what rhymes with singlerail.
rail male fail mail sale pale sail tail tale trail avail jail nail veil frail gale hail shale whale bail vale wail assail bale dale pail flail hale braille kale grail faille wale carrell scale email stale travail curtail quail snail fingernail quale derail unveil detail prevail entail inhale bewail gunwale foresail impale taffrail wassail pellmell hightail lugsail exhale mainsail pigtail topsail countervail martingale monorail bobtail nonpareil hangnail ponytail swallowtail tattletale