I had opportunity to work on 'Charlies' during my time on the footplate. Ugly Ducklings They May Have Been, But Nobody Had Any Doubts About Their Haulage Capacity. They Were Extremely Powerful Locomotives For Their Size, And I Never Heard Of An Instance Where A 'Charlie' Stalled With Any Kind Of Load. On The Working Side Their Cabs Were Unbearably Hot In The Summer And Freezingly Draughty In The Winter, But They Revelled In Hard Work. I Believe That The Multiple Jet Blastpipe Was A Significant Factor As To This Locomotive's Success. I Am Sure That A Traditional Blastpipe And Chimney Would Have Torn The Fire To Pieces. Seemingly Second Only In Length To The 'Lord Nelson's' Firebox, They Needed A Strong Arm To Feed The Front End But Would Steam In Profusion If Treated Sympathetically.