▁horizontal ▁bo ilers . ▁Although ▁successful , ▁these ▁locomot ives ▁were ▁not ▁powerful ▁enough ▁for ▁the ▁substantial ▁traffic ▁that ▁passed ▁down ▁the ▁line . ▁In ▁ 1 8 8 2 ▁the ▁railway ▁ordered ▁' Char les ', ▁a ▁large ▁ 0 - 4 - 0 ST ▁from ▁H uns let . ▁Charles ▁proved ▁very ▁successful ▁and ▁was ▁followed ▁by ▁' B lan che ' ▁and ▁' L inda ' ▁in ▁ 1 8 9 3 ▁to ▁the ▁same ▁basic ▁design . ▁These ▁locomot ives ▁were ▁the ▁main st ay ▁of ▁the ▁railway ▁for ▁the ▁rest ▁of ▁its ▁life . ▁ ▁There ▁was ▁a ▁significant ▁demand ▁for ▁building ▁materials ▁after ▁the ▁First ▁World ▁War , ▁as ▁Britain ▁recovered ▁from ▁the ▁conflict ▁and ▁many ▁new ▁houses ▁were ▁built ▁to ▁replace ▁sl ums . ▁The ▁sl ate ▁industry ▁had ▁been ▁largely ▁moth b alled ▁during ▁the ▁conflict , ▁but ▁now ▁found ▁itself ▁in ▁a ▁bo om ▁period . ▁Short ly ▁after ▁the ▁war , ▁the ▁quar ry ▁began ▁producing ▁Full ers ite ▁- ▁ground ▁sl ate ▁waste ▁- ▁which ▁was ▁sh ipped ▁in ▁large ▁quantities ▁along ▁the ▁railway . ▁ ▁In ▁ 1 9 2 4 , ▁with ▁traffic ▁continu ing ▁the ▁rise , ▁three ▁additional ▁Bald win ▁locomot ives ▁were ▁purchased . ▁These ▁had ▁been ▁built ▁for ▁war ▁use ▁by ▁the ▁United ▁States ▁Army ▁Transport ▁Cor p , ▁and ▁were ▁ref urb ished ▁before ▁being ▁sold ▁to ▁the ▁railway , ▁but ▁were ▁not ▁successful , ▁and ▁after ▁three ▁years ▁of ▁inter mitt ent ▁use ▁they