▁fifth ▁and ▁sixth ▁vehicles , ▁which ▁could ▁be ▁un ho oked . ▁ ▁The ▁rear ▁carri ages ▁run ▁away ▁ ▁The ▁un cou pling ▁accomplished ▁by ▁the ▁front ▁van ▁guard , ▁the ▁driver ▁attempted ▁to ▁start ▁the ▁front ▁portion ▁away . ▁It ▁rolled ▁back ▁slightly , ▁j ol ting ▁the ▁rear ▁portion ; ▁this ▁caused ▁the ▁whe els ▁of ▁the ▁front ▁vehicle ▁of ▁the ▁rear ▁portion ▁to ▁ride ▁up ▁over ▁the ▁stones ▁under ne ath ▁them . ▁The ▁rear ▁portion ▁had ▁been ▁standing ▁with ▁its ▁cou pl ings ▁tight , ▁but ▁now ▁only ▁the ▁rear ▁two ▁vehicles ▁were ▁in ▁any ▁way ▁rest rained , ▁so ▁that ▁the ▁leading ▁eight ▁vehicles ▁of ▁the ▁rear ▁portion ▁fell ▁back ▁on ▁to ▁them . ▁ ▁The ▁momentum ▁of ▁the ▁eight ▁vehicles ▁closing ▁on ▁the ▁rear ▁two ▁was ▁sufficient ▁to ▁push ▁them ▁over ▁the ▁stones , ▁cr ushing ▁them ▁in ▁turn , ▁so ▁that ▁now ▁only ▁the ▁hand bra ke ▁on ▁the ▁rear ▁bra ke ▁van ▁was ▁effective . ▁It ▁was ▁overcome ▁by ▁the ▁weight ▁of ▁ten ▁vehicles , ▁and ▁the ▁rear ▁portion ▁began ▁to ▁move ▁down hill ▁and ▁began ▁to ▁gather ▁speed ▁down ▁the ▁ste ep ▁gradient ▁back ▁towards ▁Arm agh ▁station . ▁" .. as ▁I ▁was ▁putting ▁down ▁the ▁last ▁stone , ▁I ▁felt ▁the ▁carri ages ▁coming ▁back . ▁I ▁went ▁on ▁the ▁van , ▁and ▁got ▁in , ▁and ▁tried , ▁with ▁the ▁assistance ▁of ▁two ▁passengers ▁to ▁get ▁an ▁extra ▁turn ▁at ▁the ▁bra ke ▁handle , ▁' and ▁was ▁still ▁doing