ADW: Rallidae: Classification
... invisible rail)
animaldiversity.ummz.umich.edu/site/accounts/classification/Rallidae.html

Case 4 Genie, The Wild Child Research or Exploitation?
The social worker noticed that the "small withered girl" had "a halting gait" and "hands held up as though resting on an invisible rail," which gave her a curious, unnaturally
highschoolbioethics.georgetown.edu/units/cases/unit3_4.html

ADW: Habroptila: Classification
... invisible rail)
animaldiversity.ummz.umich.edu/site/accounts/classification/Habroptila.html

BIRDNET: Gruiformes species list
Invisible Rail Habroptila wallacii New Guinea Flightless Rail Megacrex inepta Watercock Gallicrex cinerea Purple Swamphen Porphyrio porphyrio Lord Howe Island Swamphen Porphyrio albus
www.nmnh.si.edu/BIRDNET/splists/Gruiformescl.html

ADW: Habroptila wallacii: Classification
... invisible rail)
animaldiversity.ummz.umich.edu/site/accounts/classification/Habroptila_wallacii.html

Wisconsin Academy Review: Browse Text
His body twists to the left, his left arm held straight down, so as not to disturb his broken ribs, its fist clenched as if holding an invisible rail to steady himself.
digicoll.library.wisc.edu/cgi-bin/wiacrev/wiacrev-idx?type=HTML&rgn=DIV1&byte=486437&q1=...

Hall's Frank Freeman
He must be an idiot or a knave who superintends an invisible rail-way to transport North every black, that has an ambition to
utc.iath.virginia.edu/proslav/prfibrha6t.html

UTC
He must be an idiot or a knave who superintends an invisible rail-way to transport North every black, that has an ambition to
utc.iath.virginia.edu/saxon/servlet/SaxonServlet?source=utc/xml/responses/proslav/...

www2.cddc.vt.edu
...depending here and there from an invisible rail, was SIMPLEDORIA. II . Mrs. Apperthwaite's was a commodious old house, the greater part of it
www2.cddc.vt.edu/gutenberg/etext04/bslcp10.txt

Orange Edges Varsity
Also ineluded ill the luuagazine are lall al ticle by John A. Sibley, '43, en-i' tIl "Spotting Danger", oil mleanss ti loc ating invisible rail defects, and [ a rliscussion of butt-welding of rails b
tech.mit.edu/V61/PDF/N28.pdf