. ▁The ▁new ▁railway ▁was ▁also ▁ ▁gauge . ▁The ▁connection ▁to ▁the ▁L lande g ai ▁fl int ▁mill ▁continued ▁to ▁be ▁used ▁until ▁ 1 8 3 1 . ▁The ▁rail road ▁was ▁operated ▁by ▁horse ▁power ▁along ▁with ▁gravity ▁and ▁three ▁bal anced ▁incl ines ▁– ▁" Port " ▁( s ometimes ▁called ▁" M arch og ion ") ▁near ▁L lande g ai , ▁which ▁was ▁inherited ▁from ▁the ▁L lande g ai ▁Tr am way , ▁" D inas " ▁north ▁east ▁of ▁T reg arth ▁and ▁" C il ger aint " ▁a ▁short ▁distance ▁north ▁of ▁Co ed - y - Par c ▁work sh ops ▁in ▁Beth es da . ▁The ▁longest ▁extended ▁for ▁ 2 2 0 ▁yards . ▁With ▁h inds ight ▁this ▁seems ▁hard ▁work , ▁but ▁the ▁overall ▁gain ▁was ▁remarkable , ▁shown ▁not ▁least ▁by ▁the ▁cost ▁of ▁transport ▁falling ▁from ▁ 4 ▁sh ill ings ▁per ▁ton ▁to ▁ 1 ▁sh illing ▁ ▁By ▁the ▁early ▁ 1 8 7 0 s ▁the ▁Pen rh yn ▁Qu ar ry ▁Railway ▁was ▁no ▁longer ▁able ▁to ▁keep ▁up ▁with ▁the ▁output ▁of ▁the ▁Pen rh yn ▁quar ry . ▁By ▁ 1 8 7 4 ▁the ▁decision ▁had ▁been ▁made ▁to ▁replace ▁the ▁rail road ▁with ▁a ▁steam ▁locomot ive ▁worked ▁railway ▁without ▁ro pe - h au led ▁incl ines . ▁Ste am ▁locomot ives ▁had ▁already ▁been ▁introduced ▁with ▁great ▁success ▁on ▁the ▁quar ry ' s ▁internal