This topic was originally envisaged as only illustrating some of the early diesels at ICI's Tunstead and Hindlow Quarries which were rebuilt in their workshops into very unusual looking machines, including the steam loco conversion now at the National Stone Centre and recently illustrated in this forum.  However in the course of scanning old negatives I thought some of the other photos taken at the time (1960s) might be of interest.  The limestone trains in ICI's own fleet of hopper wagons and t