▁experienced ▁on ▁board . ▁ ▁The ▁contact ▁side ▁forces ▁result ▁in ▁a ▁g im bal ▁def lection ▁bias ▁in ▁a ▁Sh il ov sky ▁loop . ▁This ▁may ▁be ▁used ▁as ▁an ▁input ▁to ▁a ▁slower ▁loop ▁to ▁shift ▁the ▁centre ▁of ▁gravity ▁later ally , ▁so ▁that ▁the ▁vehicle ▁remains ▁u pr ight ▁in ▁the ▁presence ▁of ▁sust ained ▁non - in ert ial ▁forces . ▁This ▁combination ▁of ▁gy ro ▁and ▁later al ▁c g ▁shift ▁is ▁the ▁subject ▁of ▁a ▁ 1 9 6 2 ▁pat ent . ▁A ▁vehicle ▁using ▁a ▁gy ro / l ater al ▁payload ▁shift ▁was ▁built ▁by ▁Ernest ▁F . ▁Sw in ney , ▁Harry ▁Fer re ira ▁and ▁Louis ▁E . ▁Sw in ney ▁in ▁the ▁US ▁in ▁ 1 9 6 2 . ▁This ▁system ▁is ▁called ▁the ▁Gy ro - D ynam ics ▁mon or ail . ▁ ▁Pot ential ▁advantages ▁over ▁two - ra il ▁vehicles ▁▁ ▁The ▁advantages ▁of ▁the ▁mon or ail ▁over ▁conventional ▁rail ways ▁were ▁summar ised ▁by ▁Sh il ov sky . ▁The ▁following ▁have ▁been ▁claimed . ▁ ▁Red u ced ▁right - of - way ▁problem ▁▁ ▁The ▁close ▁association ▁of ▁the ▁vehicle ▁with ▁its ▁single ▁rail , ▁its ▁inher ent ▁ability ▁to ▁bank ▁on ▁b ends , ▁and ▁the ▁reduced ▁reli ance ▁on ▁ad hes ion ▁forces ▁are ▁all ▁factors ▁which ▁are ▁pert inent ▁to ▁the ▁development ▁of ▁surface ▁travel . ▁In ▁principle , ▁ste eper ▁grad ients ▁and ▁sh ar per