Original sentence: Both classes remained almost unchanged througout their working lives which involved working the 1.75 mile long branch from Kittybrewster to Waterloo Docks in Aberdeen, local trips, and hire to nearby industry
Edited sentence: Both classes remained almost unchanged throughout their working lives which involved working the 1.75 mile long branch from Kittybrewster to Waterloo Docks in Aberdeen, local trips, and hire to nearby industry