MGR trains to Hope Cement during late 80s

[Global]

I’ve been looking for details on the MGR Coal trains that ran to Hope Cement (Earles Sidings) during the late 80s early 90s sectorisation period.

 

Unfortunately I’ve not been able to find much info or photos of these.

 

I’m interested in where the workings originated from, the typical number of HAA hoppers (did they use full length sets or were they reduced) and usual motive power type if possible. 
 

Any specific details like head code and timing would be great as well!

 

Many thanks in advance for any help with this.