Coal Boards on the sides of tenders

Hi Folks
I've seen some photos (can't recall the site) of coal boards being used on the sides of tenders to increase the amount coal carried. Was this a common practice or was it down to individual crews?
regards
Martyn
I've seen some photos (can't recall the site) of coal boards being used on the sides of tenders to increase the amount coal carried. Was this a common practice or was it down to individual crews?
regards
Martyn
