Despite the light having gone for photography, as it was a dry and not very cold evening, we stayed to watch and listen to the Duchess climbing Llanvihangel Bank. Surprised to hear a number of slips before she came into view at Pandy; and then there were a few more over the final mile we watched despite the steady continuous diesel assistance. Never seen a steam locomotive slip as many times on the bank, not even on a frosty night. None of the service trains had any issues. Was there any slipping on Old Hill?