K Glossary of rail transport terms
^ technical manual tm 5-370: railroad construction. united states department of army. september 1970. p. glossary 6.
^ code of federal regulations of united states of america - 49: transportation. office of federal register, national archives , records administration. october 2006. p. 115.
^ taking chances . railroad men. xviii (12): 460. september 1905.
^ bibel, george (2012). train wreck: forensics of rail disasters. baltimore, md: johns hopkins university press. pp. 145–146. isbn 978-1-4214-0590-2.
^ simon iwnicki, ed. (2006). handbook of railway vehicle dynamics. boca raton, florida: crc press. p. 184. isbn 0-8493-3321-0.
^ patent 936046, schroeder, william s., car-coupling , issued 5 october 1909
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