▁Arm agh ▁Station ▁involved ▁a ▁ste ep ▁continuous ▁clim b , ▁up ▁a ▁gradient ▁of ▁ 1 ▁in ▁ 8 2 ▁( 1 . 2 2 %) ▁and ▁then ▁ 1 ▁in ▁ 7 5 ▁( 1 . 3 3 %). ▁Else where ▁on ▁the ▁line , ▁there ▁were ▁grad ients ▁as ▁severe ▁as ▁ 1 ▁in ▁ 7 0 . 2 ▁( 1 . 4 2 %). ▁ ▁Ask ed ▁to ▁provide ▁rolling ▁stock ▁for ▁a ▁special ▁train ▁to ▁take ▁ 8 0 0 ▁exc urs ion ists , ▁the ▁locomot ive ▁department ▁at ▁D und alk ▁sent ▁fifteen ▁vehicles ▁ha u led ▁by ▁a ▁' four - cou ple d ' ▁( 2 - 4 - 0 ) ▁locomot ive ; ▁however ▁the ▁instructions ▁to ▁the ▁engine ▁driver ▁were ▁that ▁the ▁train ▁was ▁to ▁be ▁of ▁th ir teen ▁vehicles . ▁There ▁were ▁more ▁int ending ▁passengers ▁than ▁anticip ated ▁and , ▁ ▁to ▁accommod ate ▁the ▁exc urs ion , ▁the ▁Arm agh ▁station ▁master ▁decided ▁to ▁use ▁all ▁fifteen ▁vehicles . ▁The ▁engine ▁driver , ▁who ▁had ▁never ▁driven ▁the ▁route ▁before ▁( but ▁had ▁been ▁over ▁it ▁with ▁exc urs ion ▁trains ▁when ▁a ▁fire man ), ▁object ed ▁to ▁these ▁instructions , ▁saying ▁that ▁his ▁instructions ▁were ▁that ▁the ▁train ▁was ▁to ▁be ▁of ▁th ir teen ▁vehicles ▁at ▁most . ▁According ▁to ▁the ▁driver ▁ ▁Two ▁other ▁witness es ▁said ▁that ▁the ▁driver ▁had ▁asked ▁for ▁a ▁second ▁engine ▁if ▁more ▁carri ages ▁were ▁added ▁and