Earlier members of the class ran with the destreamlined tender (TK9) or the non-streamlined tender (TK10). Like the three tenders provided for locos 6253-55 (TK11), these final two were built contemporaneously with the 9 ton type provided for the Class 5 (TK3) and showed the same modifications. The main difference was the provision of a welded water tank so that there was no visible joint between the tank top and the tender sides and rear. However, the position of the internal baffles and ribs in the coal space was evidenced by lines of rivets which marked them out from the fully welded and hence smooth sided earlier style. Unlike the preceding three tenders the last two reverted to the low cut out at the front, so giving them a superficial similarity to the non-streamlined pattern. The rear, however, had conventional steps with a side handrail, ascending steps on the frames and a single water filler. Like all except the five provided originally for 6230-4 there were no tubular air vents. These were fabricated and concealed within the structure.
The tender underframe had roller bearing axleboxes. Water sieve boxes were fitted from inception.
Sold as one each of the TB12, TF3 and TC3 packs, at a discounted price.